Question 1: Palette 1/142

Allen MCQ

The function of tracheal cilia is to

A

Pass mucus out

B

Pass mucus in

C

Pass air out

D

Pass air in

Question 2: Palette 2/142

Allen MCQ

Which of the following prevents collapsing of trachea?

A

Muscles

B

Diaphragm

C

Ribs

D

Cartilaginous rings

Question 3: Palette 3/142

Allen MCQ

Tracheal rings are:-

A

Complete

B

Incomplete

C

Dorsally incomplete

D

Laterally incomplete

Question 4: Palette 4/142

Allen MCQ

Inflammation of the lung covering causing severe chest pain is

A

Emphysema

B

Pleurisy

C

Asphyxia

D

Hypoxia

Question 5: Palette 5/142

Allen MCQ

Which of the following is not a part of respiratory tract?

A

Nasal chamber

B

Oesophagus

C

Pharynx

D

Trachea

Question 6: Palette 6/142

Allen MCQ

The epithelium of respiratory bronchioles is:-

A

Pseudostratified columnar

B

Simple squamous

C

Pseudostratified and sensory

D

Cuboidal and columnar

Question 7: Palette 7/142

Allen MCQ

Lungs are covered by

A

Perichondrium

B

Pleural sac

C

Pericardium

D

Periostium

Question 8: Palette 8/142

Allen MCQ

Which one of the following statement is correct?

A

Chest expands because air enters into the lungs

B

Air enters into the lungs because chest expands

C

The muscles of the diaphragm contracts because air enters into the lungs

D

All of the above statements are correct

Question 9: Palette 9/142

Allen MCQ

After deep inspiration, capacity of maximum expiration of lung is called:-

A

Total lung capacity

B

Functional residual capacity

C

Vital capacity

D

Inspiratory capacity

Question 10: Palette 10/142

Allen MCQ

Which statement is correct?

A

Pulmonary ventilation is equal to alveolar ventilation.

B

Pulmonary ventilation is less than alveolar ventilation.

C

Alveolar ventilation is more than Pulmonary ventilation.

D

Alveolar ventilation is less than Pulmonary ventilation.

Question 11: Palette 11/142

Allen MCQ

About 1500 ml of air left in lungs is called

A

Tidal volume

B

Inspiratory reserve volume

C

Residual volume

D

Vital capacity

Question 12: Palette 12/142

Allen MCQ

At high altitude, RBC of human blood will

A

Increase in number

B

Decrease in number

C

Decrease in size

D

Increase in size

Question 13: Palette 13/142

Allen MCQ

Which one has the lowest value?

A

Tidal volume

B

Vital capacity

C

Inspiratory reserve volume

D

Expiratory reserve volume

Question 14: Palette 14/142

Allen MCQ

Volume of air inspired or expired with each normal breath is known as -

A

Inspiratory capacity

B

Total lung capacity

C

Tidal volume

D

Residual volume

Question 15: Palette 15/142

Allen MCQ

Total lung capacity is :-

A

Total volume of air accommodated in lungs at the end of forced inspiration

B

RV + ERV + TV + IRV

C

Vital capacity + Residual volume

D

All of the above

Question 16: Palette 16/142

Allen MCQ

Which instrument helps in clinical assessment of pulmonary volumes?

A

Sphygmomanometer

B

Stethoscope

C

Spirometer

D

Electrocardiograph

Question 17: Palette 17/142

Allen MCQ

Volume of air remains in the lungs after normal expiration is

A

ERV + RV

B

IRV + RV

C

RV + IRV + ERV

D

TV

Question 18: Palette 18/142

Allen MCQ

Which of the following volume is not included in vital capacity?

A

ERV

B

TV

C

IRV

D

RV

Question 19: Palette 19/142

Allen MCQ

The upper region of pharynx in human is called :-

A

Oropharynx

B

Nasopharynx

C

Laryngopharynx

D

None of these

Question 20: Palette 20/142

Allen MCQ

Friction on the lungs surface reduces by

A

double layered pleura

B

single layered pleura

C

ribs covering lungs

D

mucous membrane surrounding the lungs.

Question 21: Palette 21/142

Allen MCQ

In lungs, air is separated from venous blood by:

A

Squamous epithelium + tunica externa of blood vessel

B

Squamous epithelium + endothelium of blood vessel

C

Transitional epithelium + tunica media of blood vessel

D

Columnar epithelium + 3 layered wall of blood vessel.

Question 22: Palette 22/142

Allen MCQ

In lung, gaseous exchange is done by :-

A

Simple diffusion

B

Active transport

C

Passive transport

D

Facilitated diffusion

Question 23: Palette 23/142

Allen MCQ

Which of the following statements is not true?

A

The partial pressure of $\mathsf { O } _ { 2 }$ in deoxygenated blood is 40 mm Hg.

B

The partial pressure of $\mathsf { O } _ { 2 }$ in oxygenated blood is 95 mm Hg.

C

The partial pressure of $\mathsf { O } _ { 2 }$ in alveolar air is 104 mm Hg.

D

The partial pressure of $\complement 0 _ { 2 }$ in alveolar air is 45 mm Hg.

Question 24: Palette 24/142

Allen MCQ

Partial pressure of oxygen in alveoli, atmospheric air and tissue will be

A

40, 159, 45

B

40, 0.3, 45

C

104, 159, 40

D

104, 0.3, 45

Question 25: Palette 25/142

Allen MCQ

What will be the $pO_2$ and ${ \mathsf { p C O } } _ { 2 }$ in the atmospheric air compared to those in the alveolar air?

A

${ \mathsf { p O } } _ { 2 }$ lesser, ${ \mathsf { p C O } } _ { 2 }$ higher

B

${ \mathsf { p O } } _ { 2 }$ higher, ${ \mathsf { p C O } } _ { 2 }$ lesser

C

${ \mathsf { p O } } _ { 2 }$ higher, ${ \mathsf { p C O } } _ { 2 }$ higher

D

${ \mathsf { p O } } _ { 2 }$ lesser, ${ \mathsf { p C O } } _ { 2 }$ lesser

Question 26: Palette 26/142

Allen MCQ

Partial pressure of $\mathsf { C O } _ { 2 }$ is higher :-

A

At alveolar level

B

At tissue level

C

In atmosphere

D

In oxygenated blood

Question 27: Palette 27/142

Allen MCQ

In the given diagram, identify what is depicted by A, B and C. Choose the correct option.

A

A-Air going out from lungs, B-Ribs and sternum relaxed, C-volume of thorax increased

B

A-Air entering lungs, B-Ribs and sternum relaxed, C-volume of thorax increased

C

A-Air entering lungs, B-Ribs and sternum raised, C-volume of thorax increased

D

A -Air going out from lungs, B-Ribs and sternum relaxed, C-volume of thorax decreased

Question 28: Palette 28/142

Allen MCQ

Almost same ${ \mathsf { p O } } _ { 2 }$ in humans is found in

A

alveoli and tissues

B

oxygenated blood and deoxygenated blood

C

alveoli and oxygenated blood

D

alveoli and deoxygenated blood

Question 29: Palette 29/142

Allen MCQ

Arrange the following in the order if increasing volume
(i) Tidal volume
(ii) Residual volume
(iii) Expiratory reserve volume
(iv) Vital capacity

A

(i) < (ii) < (iii) < (iv)

B

(i) < (iii) < (ii) < (iv)

C

(i) < (iv) < (iii) < (ii)

D

(i) < (iv) < (ii) < (iii)

Question 30: Palette 30/142

Allen MCQ

Under normal condition 100 ml blood deliver ________ to tissue.

A

4 ml $\mathsf { O } _ { 2 }$

B

10 ml $\mathsf { O } _ { 2 }$

C

5 ml $\mathsf { O } _ { 2 }$

D

25 ml $\mathsf { O } _ { 2 }$

Question 31: Palette 31/142

Allen MCQ

Effect of $\complement 0 _ { 2 }$ concentration on dissociation of oxyhaemoglobin is called:

A

Bohr's effect

B

Haldane effect

C

Hamburger effect

D

Root effect

Question 32: Palette 32/142

Allen MCQ

Chloride shift occurs for the transport of:

A

${ { 0 } _ { 2 } }$

B

$\mathsf { C O } _ { 2 }$

C

CO

D

${ { 0 } _ { 3 } }$

Question 33: Palette 33/142

Allen MCQ

Exchange of bicarbonates and chloride ions between RBC and plasma is called:-

A

Chloride shift.

B

Bohr's effect.

C

Haldane's effect.

D

Intra cellular respiration.

Question 34: Palette 34/142

Allen MCQ

Determination of oxygen carried by haemoglobin is done by

A

pH

B

Partial pressure of oxygen

C

Partial pressure of carbon dioxide

D

All the above

Question 35: Palette 35/142

Allen MCQ

For proper transport of $\mathsf { O } _ { 2 }$ and ${ \mathsf { C O } } _ { 2 } ,$ , blood should be

A

Slightly acidic

B

Strongly acidic

C

Strongly alkaline

D

Slightly alkaline

Question 36: Palette 36/142

Allen MCQ

What would happen when blood is acidic?

A

Binding of oxygen with haemoglobin increases

B

Red blood corpuscles are formed in higher number

C

Binding of oxygen with haemoglobin decreases

D

There is no change in oxygen binding nor number of RBC

Question 37: Palette 37/142

Allen MCQ

The chloride shift is movement of $Cl^–$

A

From plasma to RBC

B

From WBC to plasma

C

From RBC to plasma

D

From plasma to WBC

Question 38: Palette 38/142

Allen MCQ

Chloride shift occurs in respond to :

A

$\mathsf { H } ^ { + }$

B

$\mathsf { K } ^ { + }$

C

${ \mathsf { H C O } } _ { 3 } ^ { - }$

D

${ \mathsf { N } } { \mathsf { a } } ^ { + }$

Question 39: Palette 39/142

Allen MCQ

What happen to the $\mathsf { O } _ { 2 }$ dissociation curve of Hb if pH is decreased ?

A

shift to left

B

shift to right

C

remain unchanged

D

will oscillate erratically

Question 40: Palette 40/142

Allen MCQ

Dissociation curve shifts to the right when:-

A

$\mathsf { C O } _ { 2 }$ concentration decreases

B

$\mathsf { C O } _ { 2 }$ concentration increases

C

$\mathsf { O } _ { 2 }$ concentration increases

D

$\mathsf { H } ^ { + }$ concentration decreases

Question 41: Palette 41/142

Allen MCQ

Oxyhaemoglobin acts as

A

Alkali

B

Acid

C

Neutral

D

Buffer

Question 42: Palette 42/142

Allen MCQ

The oxygen dissociation curve will show a right shift in case of :-

A

Less $H^+$ concentration

B

High partial pressure of $\mathsf { O } _ { 2 }$

C

Low partial pressure of $\complement 0 _ { 2 }$

D

High temperature.

Question 43: Palette 43/142

Allen MCQ

Which of the following conditions are found in the alveoli of lungs : I. High ${ \mathsf { p O } } _ { 2 }$ II. Low ${ \mathsf { p C O } } _ { 2 }$ III. High ${ \mathsf { p C O } } _ { 2 }$ IV. Low ${ \mathsf { p O } } _ { 2 }$ V. Low $\mathsf { H } ^ { + }$ VI. High $\mathsf { H } ^ { + }$ Choose the correct option.

A

I, III and V

B

III, IV and VI

C

I, IV and VI

D

I, II and V

Question 44: Palette 44/142

Allen MCQ

Binding of $\mathsf { C O } _ { 2 }$ to oxyhaemoglobin occurs when :

A

${ \mathsf { p C O } } _ { 2 }$ is high and ${ \mathsf { p O } } _ { 2 }$ is less in tissue

B

${ \mathsf { p C O } } _ { 2 }$ is low and ${ \mathsf { p O } } _ { 2 }$ is high in tissue

C

${ \mathsf { p C O } } _ { 2 }$ is low and ${ \mathsf { p } } { \mathsf { O } } _ { 2 }$ is low in tissue

D

${ \mathsf { p C O } } _ { 2 }$ is high and ${ \mathsf { p } } { \mathsf { O } } _ { 2 }$ is high in tissue

Question 45: Palette 45/142

Allen MCQ

In Bohr's effect, curve shift to right when :-

A

${ \mathsf { p C O } } _ { 2 }$ decreases and $\mathsf { p } 5 0 0 _ { 2 }$ increases

B

${ \mathsf { p C O } } _ { 2 }$ increases and $\mathsf { p } 5 0 0 _ { 2 }$ decreases

C

${ \mathsf { p C O } } _ { 2 }$ increases and $\mathsf { p } 5 0 0 _ { 2 }$ increases

D

${ \mathsf { p C O } } _ { 2 }$ increases and p50 $\mathsf { O } _ { 2 }$ decreases and pH increases

Question 46: Palette 46/142

Allen MCQ

In which three forms $\mathsf { C O } _ { 2 }$ is transported by blood?

A

As a solution, Carbamino compounds, bicarbonates

B

As a solution, Carbamino proteins, ${ \sf K H C O 3 }$

C

As a solution, Carbamino haemoglobin, NaH $\mathsf { I C O } _ { 3 }$

D

As a solution, Carbamino compound, ${ \sf H } _ { 2 } { \sf C } { \sf O } _ { 3 }$

Question 47: Palette 47/142

Allen MCQ

H. Hb is :-

A

$H_2$ b

B

Heavy hydrogen bond

C

Reduced bromide

D

Haemoglobin acid

Question 48: Palette 48/142

Allen MCQ

During transport of $\mathsf { C O } _ { 2 } ,$ blood does not become acidic due to :

A

Neutralisation of ${ \sf H } _ { 2 } { \sf C } { \sf O } _ { 3 }$ by ${ \sf N a } _ { 2 } { \sf C O } _ { 3 }$

B

Absorption by leucocytes

C

Blood buffers

D

Non-accumulation

Question 49: Palette 49/142

Allen MCQ

Rate of respiration is directly affected by

A

$\mathsf { C O } _ { 2 }$ concentration

B

${ { 0 } _ { 2 } }$ in trachea

C

Concentration of $\mathsf { O } _ { 2 }$

D

Diaphragm expansion

Question 50: Palette 50/142

Allen MCQ

CO is more toxic than $\mathsf { C O } _ { 2 }$ because it :

A

Damages lungs

B

It destroys haemoglobin

C

Affects the nervous system

D

Reduces the oxygen carrying capacity of haemoglobin

Question 51: Palette 51/142

Allen MCQ

Carbon monoxide has greater affinity for haemoglobin as compare to oxygen :-

A

1000 Times

B

200 Times

C

20 Times

D

2 Times

Question 52: Palette 52/142

Allen MCQ

About 97% of oxygen is transported by RBC remaining 3% is :-

A

Dissolved in plasma & transported

B

Retained in lungs

C

Attached to cell membranes

D

Found inside mitochondria

Question 53: Palette 53/142

Allen MCQ

Increased asthmatic attacks in certain seasons are related to :-

A

Hot and humid environment

B

Eating fruits preserved in tin containers

C

Inhalation of seasonal pollen

D

Low temperature

Question 54: Palette 54/142

Allen MCQ

Disease aggravated by pollution is :-

A

Haemophilia

B

Rheumatism

C

Scurvy

D

Bronchitis

Question 55: Palette 55/142

Allen Match the Columns

represents diseases and represents their symptoms. Which of the following pairs are correctly matched for them? Match with

Column-I	Column-II
(P) Asthma (Q) Emphysema (R) Pneumonia	(I) Damaged alveolar walls (II) Accumulation of W.B.C. in alveolus (III) Allergy

A

P-III, Q-II, R-I

B

P-III, Q-I, R-II

C

P-II, Q-III, R-I

D

P-I, Q-II, R-III

Question 56: Palette 56/142

Allen MCQ

Approximately seventy percent of carbondioxide absorbed by the blood will be transported to the lungs:

A

as bicarbonate ions

B

in the form of dissolved gas molecules

C

by binding to R.B.C.

D

as carbamino - haemoglobin

Question 57: Palette 57/142

Allen MCQ

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?

A

rising $\mathsf { C O } _ { 2 }$ concentration

B

falling $\mathsf { C O } _ { 2 }$ concentration

C

rising $\mathsf { C O } _ { 2 }$ and falling ${ { 0 } _ { 2 } }$ concentration

D

falling $O_2$ concentration

Question 58: Palette 58/142

Allen MCQ

Asthma may be attributed to :

A

bacterial infection of the lungs

B

allergic reaction of the mast cells in the lungs

C

inflammation of the trachea

D

accumulation of fluid in the lungs

Question 59: Palette 59/142

Allen MCQ

The partial pressure of oxygen in the alveoli of the lungs is :-

A

Less than that in the blood

B

Less than that of carbon dioxide

C

Equal to that in the blood

D

More than that in the blood

Question 60: Palette 60/142

Allen MCQ

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because :-

A

There is a positive intrapleural pressure

B

Pressure in the lungs is higher than the atmospheric pressure.

C

There is a negative pressure in the lungs.

D

There is a negative intrapleural pressure pulling at the lung walls

Question 61: Palette 61/142

Allen MCQ

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:

A

Inspiratory Reserve Volume

B

Tidal Volume

C

Expiratory Reserve Volume

D

Residual Volume

Question 62: Palette 62/142

Allen MCQ

Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?

A

Inflammation of bronchioles;
Decreased respiratory surface

B

Increased number of bronchioles;
Increased respiratory surface

C

Increased respiratory surface;
Inflammation of bronchioles

D

Decreased respiratory surface;
Inflammation of bronchioles

Question 63: Palette 63/142

Allen Match the Columns

Match the items given in column-I with those in column-II and select the correct option given below:
Match Column-I with Column-II:

Column-I	Column-II
(A) tidal volume (B) inspiratory reserve volume (C) expiratory reserve volume (D) residual volume	(I) 2500–3000 ml (II) 1100–1200 ml (III) 500–550 ml (IV) 1000–1100 ml

A

A-III, B-I, C-IV, D-II

B

A-III, B-I, C-IV, D-II

C

A-III, B-IV, C-II, D-III

D

A-IV, B-III, C-II, D-I

Question 64: Palette 64/142

Allen MCQ

Which of the following is an occupational respiratory disorder ?

A

Anthracis

B

Silicosis

C

Botulism

D

Emphysema

Question 65: Palette 65/142

Allen MCQ

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

A

1500 mL

B

1700 mL

C

2200 mL

D

2700 mL

Question 66: Palette 66/142

Allen MCQ

Select the correct statement.

A

Expiration occurs due to external intercostal muscles

B

Intrapulmonary pressure is lower than the atmospheric pressure during inspiration.

C

Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure.

D

Expiration is initiated due to contraction of diaphragm.

Question 67: Palette 67/142

Allen MCQ

The maximum volume of air a person can breathe in after a forced expiration is known as:

A

Expiratory Capacity

B

Vital Capacity

C

Inspiratory Capacity

D

Total lung Capacity

Question 68: Palette 68/142

Allen MCQ

Identify the wrong statement with reference to transport of oxygen.

A

Low pCO₂ in alveoli favours the formation of oxyhaemoglobin.

B

Binding of oxygen with haemoglobin is mainly related to partial pressure of O₂.

C

Partial pressure of CO₂ can interfere with O₂ binding with haemoglobin.

D

Higher H⁺ conc. in alveoli favours the formation of oxyhaemoglobin.

Question 69: Palette 69/142

Allen MCQ

Select the correct events that occur during inspiration.
(a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases

A

only (d)

B

(a) and (b)

C

(c) and (d)

D

(a), (b) and (d)

Question 70: Palette 70/142

Allen MCQ

The Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a forced inspiration. This includes:

A

RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV

B

RV; ERV; IC and EC

C

RV; ERV; VC (Vital Capacity) and FRC (Functional Residual Capacity)

D

RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume)

Question 71: Palette 71/142

Allen Match the Columns

Match the following columns and select the correct option : Match Column-I with Column-II:

Column-I	Column-II
(A) Pneumotaxic Centre (B) O₂ Dissociation (C) Carbonic Anhydrase (D) Primary site of exchange of gases	(I) Alveoli (II) Pons region of brain (III) Haemoglobin (IV) R.B.C.

A

A-I, B-III, C-II, D-IV

B

A-II, B-III, C-IV, D-I

C

A-III, B-II, C-IV, D-I

D

A-IV, B-I, C-III, D-II

Question 72: Palette 72/142

Allen MCQ

The partial pressures (in mm Hg) of oxygen $( 0 _ { 2 } )$ and carbon dioxide (CO ) at alveoli (the site of diffusion) are :

A

${ \mathsf { p O } } _ { 2 } = 1 0 4$ and ${ \mathsf { p C O } } _ { 2 } = 4 0$

B

${ \mathsf p } { \mathsf O } _ { 2 } = 4 0$ and ${ \mathsf { p C O } } _ { 2 } = 4 5$

C

${ \mathsf p } { \mathsf O } _ { 2 } = 9 5$ and ${ \mathsf { p C O } } _ { 2 } = 4 0$

D

${ \mathsf p } { \mathsf O } _ { 2 } = 1 5 9$ and ${ \mathsf { p C O } } _ { 2 } = 0 . 3$

Question 73: Palette 73/142

Allen MCQ

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

A

High ${ \mathsf { p O } } _ { 2 } ,$ low ${ \mathsf { p C O } } _ { 2 } ,$ less ${ \mathsf { H } } ^ { + } ,$ , lower temperature

B

Low ${ \mathsf { p O } } _ { 2 } ,$ high ${ \mathsf { p C O } } _ { 2 } ,$ more ${ \mathsf { H } } ^ { + } ,$ , higher temperature

C

High ${ \mathsf { p O } } _ { 2 } ,$ , high ${ \mathsf { p C O } } _ { 2 } ,$ less ${ \mathsf { H } } ^ { + } ,$ , higher temperature

D

Low ${ \mathsf { p O } } _ { 2 } ,$ low ${ \mathsf { p C O } } _ { 2 } ,$ more ${ \mathsf { H } } ^ { + }$ , higher temperature

Question 74: Palette 74/142

Allen MCQ

Which of the following is not the function of conducting part of respiratory system ?

A

Inhaled air is humidified

B

Temperature of inhaled air is brought to body temperature

C

Provides surface for diffusion of $\mathsf { O } _ { 2 }$ and $\mathsf { C O } _ { 2 }$

D

It clears inhaled air from foreign particles

Question 75: Palette 75/142

Allen MCQ

Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver ml of $\mathsf { O } _ { 2 }$ to the tissues.

A

5ml

B

4 ml

C

10 ml

D

2 ml

Question 76: Palette 76/142

Allen MCQ

Which of the following statements are correct with respect to vital capacity?
(a) It includes ERV, TV and IRV (b) Total volume of air a person can inspire after a normal expiration (c) The maximum volume of air a person can breathe in after forced expiration (d) It includes ERV, RV and IRV. (e) The maximum volume of air a person can breath out after a forced inspiration.
Choose the most appropriate answer from the options given below:

A

(b), (d) and (e)

B

(a), (c) and (d)

C

(a), (c) and (e)

D

(a) and (e)

Question 77: Palette 77/142

Allen MCQ

Vital capacity of lung is

A

IRV + ERV + TV + RV

B

IRV + ERV + TV - RV

C

IRV + ERV + TV

D

IRV + ERV

Question 78: Palette 78/142

Allen MCQ

Select the sequence of steps in Respiration.
(A) Diffusion of gases $( { \mathsf { O } } _ { 2 }$ and $C 0 _ { 2 } )$ across alveolar membrane. (B) Diffusion of $\mathsf { O } _ { 2 }$ and $\mathsf { C O } _ { 2 }$ between blood and tissues. (C) Transport of gases by the blood. (D) Pulmonary ventilation by which atmospheric air is drawn in and $\mathsf { C O } _ { 2 }$ rich alveolar air is released out.
(E) Utilisation of $\mathsf { O } _ { 2 }$ by the cells for catabolic reactions are resultant release of $CO_2$
Choose the correct answer from the
options given below :-

A

(D), (A), (C), (B), (E)

B

(C), (B), (A), (E), (D)

C

(B), (C), (E), (D), (A)

D

(A), (C), (B), (E), (D)

Question 79: Palette 79/142

Allen MCQ

Assertion (A) : A person goes to high altitude and experiences ‘Altitude Sickness’ with symptoms like breathing difficulty and heart palpitations. Reason (R) : Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen. In the light of the above statements, choose the correct answer from the options given below :-

A

(A) is true but (R) is false.

B

(A) is false but (R) is true.

C

Both (A) and (R) are true and (R) is the correct explanation of (A).

D

Both (A) and (R) are true but (R) is not the correct explanation of (A).

Question 80: Palette 80/142

Allen MCQ

Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

A

High ${ \mathsf { p O } } _ { 2 }$ and High ${ \mathsf { p C O } } _ { 2 }$

B

High ${ \mathsf { p } } { \mathsf { O } } _ { 2 }$ and Lesser $\mathsf { H } ^ { + }$ concentration

C

Low ${ \mathsf { p C O } } _ { 2 }$ and High $\mathsf { H } ^ { + }$ concentration

D

Low ${ \mathsf { p C O } } _ { 2 }$ and High temperature

Question 81: Palette 81/142

Allen Match the Columns

Match Column-I with Column-II Choose the correct answer from the options given below :- Match Column-I with Column-II

Column-I	Column-II
(A) Expiratory capacity (B) Functional residual capacity (C) Vital capacity (D) Inspiratory capacity	(I) Expiratory reserve volume + Tidal volume + Inspiratory reserve volume (II) Tidal volume + Expiratory reserve volume (III) Tidal volume + Inspiratory reserve volume (IV) Expiratory reserve volume + Residual volume

A

A-II, B-IV, C-I, D-III

B

A-III, B-II, C-IV, D-I

C

A-II, B-I, C-IV, D-II

D

A-I, B-III, C-II, D-IV

Question 82: Palette 82/142

Allen Match the Columns

Match Column-I Column-II Choose the correct answer from the options given below :-

Column-I	Column-II
(A) Residual Volume (B) Vital Capacity (C) Expiratory Capacity (D) Tidal Volume	(I) Maximum volume of air that can be breathed in after forced expiration. (II) Volume of air inspired or expired during normal respiration. (III) Volume of air remaining in lungs after forcible expiration. (IV) Total volume of air expired after normal inspiration.

A

A-IV, B-III, C-II, D-I

B

A-II, B-IV, C-I, D-III

C

A-III, B-I, C-IV, D-II

D

A-I, B-II, C-III, D-IV

Question 83: Palette 83/142

Allen MCQ

Assertion A : During the transportation of gases about 20-25 percent of $\complement 0 _ { 2 }$ is carried by Haemoglobin as carbamino-haemoglobin. Reason R : This binding is related to high ${ \mathsf { p C O } } _ { 2 }$ and low ${ \mathsf { p O } } _ { 2 }$ in tissues. In the light of the above statements, choose the correct answer from the options given below :

A

A is true but R is false

B

A is false but R is true

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

Question 84: Palette 84/142

Allen MCQ

Which is a common passage for food and air?

A

Trachea

B

Oesophagus

C

Pharynx

D

Glottis

Question 85: Palette 85/142

Allen MCQ

The function of conducting part in respiratory system of human is :-

A

Clears foreign particles.

B

Humidifies atmospheric air

C

Brings the air to body temperature

D

All of the above

Question 86: Palette 86/142

Allen MCQ

When there is no air in initial bronchioles, they does not collapse. It is due to :-

A

Presence of Lecithin

B

Presence of incomplete cartilaginous rings

C

Presence of complete cartilaginous rings

D

Presence of mucous

Question 87: Palette 87/142

Allen MCQ

Which of the following steps not involved in respiration?

A

Diffusion of gases across alveolar membrane

B

Transport of gases by the blood

C

Provide nutrients to all the living cells of body

D

Utilisation of $O_2$
by the cells for catabolic reactions and resultant release of $CO_2$.

Question 88: Palette 88/142

Allen MCQ

Inspiration can occur, when –

A

Pressure within the lungs is less than the atmospheric pressure.

B

Pressure within the lungs is more than the atmospheric pressure.

C

Pressure within the lungs and atmospheric air is same.

D

No effect of pressure on inspiration.

Question 89: Palette 89/142

Allen MCQ

By the contraction in diaphragm volume of thoracic chamber increases in the :-

A

Dorso-ventral axis

B

Antero-posterior axis

C

Dorso-posterior axis

D

Antero-ventral axis

Question 90: Palette 90/142

Allen MCQ

The primary muscle of inspiration is :-

A

Diaphragm

B

Intercostal muscle

C

Abdominal muscle

D

Oblique muscle

Question 91: Palette 91/142

Allen MCQ

Total volume of air a person can expire after normal inspiration is :-

A

Vital capacity

B

Functional residual capacity

C

Inspiratory capacity

D

Expiratory capacity

Question 92: Palette 92/142

Allen MCQ

Which of the following factor can affect the rate of diffusion of gases?

A

Thickness of the membranes involved in diffusion

B

Solubility of the gases

C

Pressure of the gases

D

All of these

Question 93: Palette 93/142

Allen MCQ

Which of the following is correct?

A

Alveoli-pO₂=159 mmHg, Deoxygenated blood-pCO₂=40 mmHg, Tissue-pCO₂=20 mmHg

B

Alveoli-pCO₂=40 mmHg, Deoxygenated blood-pO₂=95 mmHg, Tissue-pO₂=40 mmHg

C

Alveoli-pO₂=104 mmHg, Deoxygenated blood-pCO₂=45 mmHg, Tissue-pCO₂=45 mmHg

D

Alveoli-pO₂=40 mmHg, Deoxygenated blood-pO₂=40 mmHg, Tissue-pCO₂=45 mmHg

Question 94: Palette 94/142

Allen MCQ

What is true about diffusion capacity?

A

Diffusion capacity of $\mathsf { C O } _ { 2 }$ is much higher than ${ { 0 } _ { 2 } }$

B

Diffusion capacity of $\mathsf { O } _ { 2 }$ is much higher than $\mathsf { C O } _ { 2 }$

C

Diffusion capacity of $\mathsf { O } _ { 2 }$ and $\mathsf { C O } _ { 2 }$ is same

D

None of the above

Question 95: Palette 95/142

Allen MCQ

Which of the following statement is true?

A

20-25 percent $\complement \mathsf { O } _ { 2 }$ is transported by RBCs.

B

97 percent $\mathsf { O } _ { 2 }$ is transported by RBCs.

C

70 percent $\mathsf { C O } _ { 2 }$ is carried as bicarbonate.

D

All of these are true.

Question 96: Palette 96/142

Allen MCQ

Binding of oxygen with haemoglobin is primarily related to :-

A

Partial pressure of $\mathsf { O } _ { 2 }$

B

Partial pressure of $\complement \mathsf { O } _ { 2 }$

C

$H^+$ ion concentration

D

Temperature

Question 97: Palette 97/142

Allen MCQ

In which the following factors can interfere in binding of $\mathsf { O } _ { 2 }$ with haemoglobin. A → $pCO_2$, B → $H^+$ ion concentration C → Temperature

A

Only A

B

B, C

C

A and C

D

A, B, C

Question 98: Palette 98/142

Allen MCQ

The conditions which are favourable for the formation of oxyhaemoglobin :-

A

pO₂↑, pCO₂↑, H⁺ concentration↓, Temperature↓

B

pO₂↓, pCO₂↓, H⁺ conc.↑, Temperature↑

C

pO₂↑, pCO₂↓, H⁺ conc.↓, Temperature↓

D

pO₂↑, pCO₂↑, H⁺ conc.↓, Temperature↑

Question 99: Palette 99/142

Allen MCQ

Which of the following statement/s is/are correct?
(A) High concentration of carbonic anhydrase is present in RBCs. (B) Minute quantities of carbonic anhydrase is present in plasma. (C) Every 100 ml blood delivers approximately 4 ml of $\mathsf { C O } _ { 2 }$ to the alveoli. (D) 20-25% $\complement 0 _ { 2 }$ is carried by haemoglobin as carbaminohaemoglobin.

A

A, C and D

B

A and D

C

A, B, C and D

D

Only A

Question 100: Palette 100/142

Allen MCQ

Which of the following statement is incorrect?

A

Among vertebrates, fishes use gills whereas amphibians, reptiles, birds and mammals respire through lungs.

B

Mechanisms of breathing vary among different groups of animals depending mainly on their habitats and levels of organisation.

C

Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange $\mathsf { O } _ { 2 }$ with $\mathsf { C O } _ { 2 }$ by osmosis over their entire body surface.

D

Earthworms use their moist cuticle and insects have a network of tubes (tracheal tubes) to transport atmospheric air within the body

Question 101: Palette 101/142

Allen MCQ

A chemo sensitive area is situated adjacent to respiratory rhythm centre which is highly sensitive to and ions.

A

$\mathsf { O } _ { 2 } , \mathsf { H } ^ { + }$

B

${ \mathsf { C O } } _ { 2 } , { \mathsf { O H } } ^ { - }$

C

${ \mathsf { C O } } _ { 2 } , { \mathsf { H } } ^ { + }$

D

${ \mathsf { C O } } _ { 2 } , { \mathsf { O } } _ { 2 }$

Question 102: Palette 102/142

Allen MCQ

Label A, B, C and D in the diagram given below

A

A–Nasopharynx, B–Oropharynx, C–Glottis, D–Gullet

B

A–Nasopharynx, B–Oropharynx, C–Gullet, D–Glottis

C

A–Oropharynx, B–Nasopharynx, C–Gullet, D–Glottis

D

A–Oropharynx, B–Nasopharynx, C–Glottis, D–Gullet

Question 103: Palette 103/142

Allen MCQ

Chronic disorder in which alveolar wall are damaged due to which respiratory surface is decreased. One of the major causes of this is cigarette smoking :-

A

Asthma

B

Emphysema

C

Bronchitis

D

Fibrosis

Question 104: Palette 104/142

Allen MCQ

What is the correct about alveoli?

A

Thin, irregular-walled and vascularised bag-like structures

B

Thick, irregular-walled and vascularised bag-like structures

C

Thin, regular-walled and vascularised bag-like structures

D

Thick, regular-walled and vascularised bag-like structures

Question 105: Palette 105/142

Allen MCQ

Total volume of air accommodate in the lungs at the end of forced inspiration :-

A

TV + IRV

B

TV + IRV + ERV

C

TV + ERV

D

TV + IRV + ERV + RV

Question 106: Palette 106/142

Allen MCQ

Mark the true statement among the following with reference to normal breathing

A

Inspiration is a passive process where as expiration is active

B

Inspiration is a active process where as expiration is passive

C

Inspiration and expiration are active processes

D

Inspiration and expiration are passive processes

Question 107: Palette 107/142

Allen MCQ

A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is

A

Total lung capacity

B

Tidal volume

C

Vital capacity

D

Inspiratory capacity

Question 108: Palette 108/142

Allen MCQ

Mark the correct pair of muscles involved in the normal breathing in humans :-

A

External and internal intercostal muscles

B

Diaphragm and abdominal muscles

C

Diaphragm and external intercostal muscles

D

Diaphragm and internal intercostal muscles

Question 109: Palette 109/142

Allen MCQ

The diffusion membrane is made up of three major layers namely.

A

The thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them.

B

The thick squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them.

C

The thin columnar epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them.

D

The thin columnar and cuboidal epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them.

Question 110: Palette 110/142

Allen MCQ

Which of the following group of animals, is used lungs for respiration?

A

Fishes, Frog, Tadpole larva

B

Fish, Mollusca, aquatic arthropods

C

Reptiles, Birds, Mammals

D

Insects, Earthworm, Mollusca

Question 111: Palette 111/142

Allen MCQ

Whether a child died after normal birth or died before birth can be confirmed by measuring :

A

Tidal volume of air

B

Residual volume of air

C

The weight of the child

D

The dead space air

Question 112: Palette 112/142

Allen MCQ

Find the correct option for the diagram given below :

A

A–Parietal pleura, B–Visceral pleura, C–Pleural cavity filled with pleural fluid

B

A–Visceral pleura, B–Parietal pleura, C–Pleural cavity filled with pleural fluid

C

A–Parietal pericardium, B–Visceral pericardium, C–Pleural cavity filled with pleural fluid

D

A–Visceral pericardium, B–Parietal pericardium, C–Pleural cavity filled with pleural fluid

Question 113: Palette 113/142

Allen MCQ

Which of the following statement is correct?

A

Alveoli are the primary sites of exchange of gases

B

Exchange of gases occur at tissue level and alveolar surface.

C

Pressure contributed by an individual gas in a mixture of gases is called partial pressure and is represented as $pO_2$ for oxygen and $pCO_2$ for carbon dioxide.

D

All of the above.

Question 114: Palette 114/142

Allen MCQ

Identify A, B and C in the given sentence Inspiration is initiated by ______ A_____ of diaphragm which____ B ____the volume of thoracic chamber in _____C _____axis.

A

A–relaxation, B–increases, C–antero posterior axis

B

A–contraction, B–decreases, C–antero posterior axis

C

A–contraction, B–increases, C–antero posterior axis

D

A–relaxation, B–contraction, C–antero posterior axis

Question 115: Palette 115/142

Allen MCQ

In lungs, there is definite exchange of ions between RBC and Plasma. Removal of CO₂ from blood involves :

A

efflux of Cl⁻ ions from RBC.

B

influx of Cl⁻ ions into RBC.

C

influx of HCO₃⁻ ions into Plasma.

D

efflux of HCO₃⁻ ions from RBC.

Question 116: Palette 116/142

Allen MCQ

The chloride content of RBC will be higher than that of plasma in :-

A

Systemic arteries and pulmonary veins.

B

Systemic veins and pulmonary arteries.

C

Systemic arteries and pulmonary arteries.

D

Systemic veins and pulmonary veins.

Question 117: Palette 117/142

Allen MCQ

Which of the following lung volumes or capacities can be measured by spirometer?

A

Functional residual capacity [FRC]

B

Residual volume

C

Total lung capacity [TLC]

D

Vital capacity

Question 118: Palette 118/142

Allen MCQ

Which of the following statement is incorrect?

A

A healthy man can inspire or expire approximately 6000 to 8000 ml of air per second.

B

Total volume of air that can accommodated in the lungs at the end of forced inspiration is called total lung capacity.

C

Total volume of air a person can expire after a normal inspiration is called expiratory capacity.

D

Amount of air remain in lungs even after deep and forceful expiration is called residual volume of air.

Question 119: Palette 119/142

Allen MCQ

The respiratory membrane facilitates the exchange of respiratory gases through diffusion. Oxygen enters the deoxygenated blood through diffusion because :-

A

Partial pressure of oxygen in alveolar air and capillaries is 40 mm Hg and 104 mm Hg respectively.

B

Partial pressure of oxygen in alveolar air and capillaries is 104 mm Hg and 40 mm Hg respectively.

C

Partial pressure of oxygen in alveolar air and capillaries is 46 mm Hg and 40mm Hg respectively.

D

Partial pressure of oxygen in alveolar air and capillaries is 40 mm Hg and 46 mm Hg respectively.

Question 120: Palette 120/142

Allen MCQ

Blood do not become acidic although it carries CO₂ because :-

A

CO₂ is continuously diffused through tissues.

B

CO₂ combines with H₂O to form HCO₃⁻.

C

In CO₂ transport, buffers plays an important role.

D

CO₂ is absorbed by WBC.

Question 121: Palette 121/142

Allen MCQ

The amount of CO₂ that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O₂. Why?

A

Because diffusion of gases takes place only at alveoli

B

Because the solubility of CO₂ is 20-25 times lesser than that of O₂

C

Because the solubility of CO₂ is 20-25 times higher than that of O₂

D

Because alveoli are very large in number

Question 122: Palette 122/142

Allen Match the Columns

Find out the correct match from the following table:
Match Column-I, Column-II and Column-III:

Column-I	Column-II	Column-III
(A) At tissue (B) In pulmonary vein (C) In systemic artery (D) In alveoli	(I) pO₂ = 40 mm Hg (II) pO₂ = 95 mm Hg (III) pO₂ = 40 mm Hg (IV) pO₂ = 104 mm Hg	(P) pCO₂ = 45 mm Hg (Q) pCO₂ = 50 mm Hg (R) pCO₂ = 40 mm Hg (S) pCO₂ = 40 mm Hg

A

Both I and II

B

Both III and IV

C

I, II and III

D

Both I and IV

Question 123: Palette 123/142

Allen Match the Columns

Match the following Column-I with Column-II:

Column-I	Column-II
(A) Inspiratory capacity (IC) (B) Expiratory capacity (EC) (C) Functional residual capacity (FRC) (D) Vital capacity (VC)	(I) Total air, a person can inspire after normal expiration (II) Maximal volume of the air, a person can breathe in after a forced expiration (III) Volume of the air that will remain in lungs after a normal expiration (IV) Total volume of air a person can expire after a normal inspiration

A

A-1, B-2, C-3, D-4

B

A-1, B-4, C-3, D-2

C

A-1, B-4, C-2, D-3

D

A-4, B-1, C-3, D-2

Question 124: Palette 124/142

Allen MCQ

Which of the following option gives correct information about the coverings of thoracic cage on various surfaces :-

A

Anterior surface-Sternum and Ribs, Posterior surface-Ribs, Dorsal surface-Diaphragm

B

Anterior surface-Sternum and Ribs, Posterior surface-Diaphragm, Dorsal surface-Clavicle bones and neck

C

Anterior surface-Sternum and Ribs, Posterior surface-Vertebral column, Dorsal surface-Clavicle bones and neck

D

Anterior surface-Clavicle bones and neck, Posterior surface-Diaphragm, Dorsal surface-Vertebral column

Question 125: Palette 125/142

Allen MCQ

Considering the following labels for mentioned structures and select the correct sequence of their arrangement :- A = Terminal bronchioles B = Respiratory bronchioles C = Tertiary bronchi D = Primary bronchi E = Secondary bronchi F = Total pulmonary bronchioles

A

D → E → C → F → A → B

B

A → B → D → E → C → F

C

C → F → A → B → D → E

D

D → E → F → C → B → A

Question 126: Palette 126/142

Allen MCQ

Consider the following four statements (a-d) and select the option which includes all the correct ones only :-
(A) All the time of inspiration, contraction in diaphragm and external intercostal muscles take place.
(B) Normal breathing is also called as abdominal breathing.
(C) Expiration during sneezing, coughing, yoga is normal expiration during which IICM and abdominal muscles relax.
(D) Inspiration can occur if the pressure within lungs (intra pulmonary pressure) is more then the atmospheric pressure.

A

Statements (a), (b), (c), (d)

B

Statements (a) only

C

Statements (a), (b), (c)

D

Statements (a) and (b)

Question 127: Palette 127/142

Allen Match the Columns

Find out the correct match from the following table :-

Match Column-I, Column-II and Column-III:

Column-I	Column-II	Column-III
(A) Tidal volume (TV) (B) Expiratory reserve volume (ERV) (C) Vital capacity (VC) (D) Residual volume (RV)	(I) (EC - ERV) (II) (VC - IRV - TV) (III) IRV + ERV + RV (IV) FRC - ERV	(P) 500 ml (Q) 3000 ml (R) 4500 ml (S) 1200 ml

A

I and II

B

I, III and IV

C

I, II and III

D

I and IV

Question 128: Palette 128/142

Allen MCQ

Find out the correct match from the following:
(I) Larynx – sound box
(II) Trachea – complete cartilaginous rings
(III) Epiglottis – elastic cartilaginous flap
(IV) Alveoli – very thin, irregular walled, vascularised bag like structures
(V) Pleural fluid – reduces friction on the lung surface

A

(i), (ii), (iii), (iv), (v)

B

(i), (iii), (iv), (v)

C

(i), (iii), (v)

D

(i) and (v)

Question 129: Palette 129/142

Allen MCQ

Which of the following statement is not correct?

A

Formation of oxyhaemoglobin is a process of oxidation.

B

Every 100 ml of oxygenated blood can deliver around 5 ml of $O_2$ to tissue under physiological condition.

C

Dissociation curve is curve between percentage saturation of Hb with oxygen and partial pressure of oxygen.

D

High concentration of $\mathsf { C O } _ { 2 }$ activates dissociation of oxyhaemoglobin is called Bohr's effect.

Question 130: Palette 130/142

Allen MCQ

Given below graph shows an oxygen dissociation curve :- Partial pressure of oxygen (mm Hg) Where in the body will haemoglobin be saturated at the percentage shown at points X, Y and Z.

A

X-Pulmonary artery, Y-Pulmonary vein, Z-Carotid artery

B

X-Systemic artery, Y-Pulmonary artery, Z-Pulmonary vein

C

X-Pulmonary vein, Y-Systemic vein, Z-Systemic vein during exercise

D

X-Left ventricle, Y-Right ventricle, Z-Systemic artery

Question 131: Palette 131/142

Allen MCQ

Which one of the following statements is incorrect ?

A

The residual air in lungs slightly decreases the efficiency of respiration in mammals

B

The presence of non–respiratory air sacs, increases the efficiency of respiration in birds

C

In insects, circulating body fluids serve to distribute oxygen to tissues

D

The principle of counter current flow facilitates efficient respiration in gills of fishes

Question 132: Palette 132/142

Allen MCQ

The majority of carbon dioxide produced by our body cells is transported to the lungs :

A

Dissolved in the blood

B

As bicarbonates

C

As carbonates

D

Attached to haemoglobin

Question 133: Palette 133/142

Allen MCQ

What is vital capacity of our lungs ?

A

Inspiratory reserve volume plus expiratory reserve volume.

B

Total lung capacity minus Residual volume.

C

Inspiratory reserve volume plus Tidal volume.

D

Total lung capacity minus Expiratory reserve volume.

Question 134: Palette 134/142

Allen MCQ

Listed below are four respiratory capacities (a-d) and four jumbled respiratory volumes of a normal human adult :
(A) Residual volume-2500 mL
(B) Vital capacity-3500 mL
(C) Inspiratory reserve volume-1200 mL
(D) Inspiratory capacity-4500 mL
Which one of the following is the correct matching of two capacities and volumes?

A

(a) 4500 mL, (b) 3500 mL

B

(b) 2500 mL, (c) 4500 mL

C

(c) 1200 mL, (d) 2500 mL

D

(d) 3500 mL, (a) 1200 mL

Question 135: Palette 135/142

Allen MCQ

what is true about RBC in humans

A

They don not carry $CO_2$ at all.

B

They carry about 20-25 per cent of ${ \mathsf { C O } } _ { 2 } .$

C

They transport 99.5 per cent of $0 _ { 2 } .$

D

They transport about 80 percent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma.

Question 136: Palette 136/142

Allen MCQ

Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of-

A

Epiglottis

B

Diaphragm

C

Neck

D

Tongue

Question 137: Palette 137/142

Allen MCQ

The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part, A, B, C or D is correctly identified along with its function

A

C → Arterial capillary-passes oxygen to tissues

B

A → Alveolar cavity-main site of exchange of respiratory gases

C

D → Capillary wall-exchange of $\mathsf { O } _ { 2 }$ and $CO_2$ takes place here

D

B → Red blood cell-transport of $\mathsf { C O } _ { 2 }$ mainly

Question 138: Palette 138/142

Allen MCQ

A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This $\mathsf { O } _ { 2 }$ :

A

Acts as a reserve during muscular exercise

B

Raises the ${ \mathsf { p C O } } _ { 2 }$ of blood to 75 mm of Hg.

C

Is enough to keep oxyhaemoglobin saturation at 96%

D

Helps in releasing more $\mathsf { O } _ { 2 }$ to the epithelial tissues

Question 139: Palette 139/142

Allen MCQ

Bulk of carbon dioxide ($CO_2$) released from body tissues into the blood is present as :

A

Carbamino-haemoglobin in RBCs

B

Bicarbonate in blood plasma and RBCs

C

Free $\mathsf { C O } _ { 2 }$ in blood plasma

D

70% carbamino-haemoglobin and 30% (4) 70% carbamino-haemoglobin and 30% as bicarbonate

Question 140: Palette 140/142

Allen MCQ

Which one of the following is the correct statement for respiration in humans ?

A

Workers in grinding and stone-breaking industries may suffer from lung fibrosis

B

Abut 90% of carbon dioxide ($CO_2$) is carried by haemoglobin as carbamino haemoglobin

C

Cigarette smoking may lead to inflammation of bronchi

D

Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration

Question 141: Palette 141/142

Allen MCQ

People who have migrated from the planes to an area adjoining Rohtang pass about six months back:

A

suffer from altitude sickness with symptoms like nausea, fatigue, etc.

B

have the usual RBC count but their haemoglobin has very high binding affinity to $\mathsf { O } _ { 2 }$

C

have more RBCs and their haemoglobin has a lower binding affinity to $O_2$

D

are not physically fit to play games like football.

Question 142: Palette 142/142

Allen MCQ

The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic :-

A

D – Lower end of lungs – diaphragm pulls it down during inspiration

B

A – trachea - long tube supported by complete cartilaginous rings for conducting inspired air

C

B – pleural membrane - surround ribs on both sides to provide cushion against rubbing

D

C – Alveoli - thin walled vascular bag like structures for exchange of gases