Question 1: Palette 1/51

NEET 2026 MCQ

In humans, respiration occurs in the following steps. Arrange these steps in the correct order.

A. Diffusion of $\mathrm{O}_2$ and $\mathrm{CO}_2$ between blood and tissues

B. Diffusion of $\mathrm{O}_2$ and $\mathrm{CO}_2$ across alveolar membrane

C. Pulmonary ventilation by which atmospheric air is drawn in and $\mathrm{CO}_2$ rich alveolar air is released out

D. Cellular respiration

E. Transport of gases by the blood

Choose the correct answer from the options given below

A

$\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}, \mathrm{E}$

B

$\mathrm{E}, \mathrm{A}, \mathrm{C}, \mathrm{D}, \mathrm{B}$

C

$\mathrm{C}, \mathrm{B}, \mathrm{E}, \mathrm{A}, \mathrm{D}$

D

$\mathrm{C}, \mathrm{A}, \mathrm{B}, \mathrm{E}, \mathrm{D}$

Question 2: Palette 2/51

NEET 2026 MCQ

$ \text { Match List-I with List-II. } $

List-I (Respiratory Volume)		List-II (Capacity in mL )
A.	ERV (Expiratory Reserve Volume)	I.	$2500-3000 \mathrm{~mL}$
B.	RV (Residual Volume)	II.	$500 \,\,mL$
C.	IRV (Inspiratory Reserve Volume)	III.	$1000-1100 \mathrm{~mL}$
D.	TV (Tidal Volume)	IV.	$1100-1200 \mathrm{~mL}$

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

Question 3: Palette 3/51

NEET 2026 MCQ

$ \text { Match List I with List II: } $

$ \text { List I  } $		$ \text { List II } $
A.	Molluscs	I.	Pulmonary respiration only
B.	Reptiles	II.	Branchial respiration
C.	Adult amphibians	III.	Cellular respiration
D.	Amoeba	IV.	Pulmonary and cutaneous respiration

Choose the correct answer from the options given below:

A

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

B

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

C

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

D

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

Question 4: Palette 4/51

NEET 2026 MCQ

In water, frogs respire using $\_\_\_\_$ .

A

trachea

B

skin

C

buccal cavity

D

lungs

Question 5: Palette 5/51

NEET 2026 MCQ

Sponges exchange $\mathrm{O}_2$ with $\mathrm{CO}_2$ by $\_\_\_\_$ .

A

gills

B

simple diffusion over their entire body surfaces

C

moist cuticle

D

tracheal tubes

Question 6: Palette 6/51

NEET 2025 MCQ

Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs.

Choose the correct answer from the following :

A

The statement is false for water but true for land

B

The statement is false for both the environment

C

The statement is true for water but false for land

D

The statement is true for both the environment

Question 7: Palette 7/51

NEET 2024 MCQ

Match List-I with List-II:

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

Choose the correct answer from the options given below:

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 8: Palette 8/51

NEET 2024 MCQ

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: During the transportation of gases, about 20-25 percent of CO$_2$ is carried by Haemoglobin as carbamino-haemoglobin.

Reason R: This binding is related to high pCO$_2$ and low pO$_2$ 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 9: Palette 9/51

NEET 2024 MCQ

Match List I with List II:

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

Choose the correct answer from the options given below :

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-III

D

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

Question 10: Palette 10/51

NEET 2024 MCQ

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

A

High $\mathrm{pO}_2$ and High $\mathrm{pCO}_2$

B

High $\mathrm{pO}_2$ and Lesser $\mathrm{H}^{+}$ concentration

C

Low $\mathrm{pCO}_2$ and High $\mathrm{H}^{+}$ concentration

D

Low $\mathrm{pCO}_2$ and High temperature

Question 11: Palette 11/51

NEET 2023 MCQ

Select the sequence of steps in Respiration.

(A) Diffusion of gases (O₂ and CO₂) across alveolar membrane.

(B) Diffusion of O₂ and CO₂ between blood and tissues.

(C) Transport of gases by the blood

(D) Pulmonary ventilation by which atmospheric air is drawn in and CO₂ rich alveolar air is released out.

(E) Utilisation of O₂ by the cells for catabolic reactions are resultant release of CO₂

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 12: Palette 12/51

NEET 2023 MCQ

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

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 13: Palette 13/51

NEET 2023 MCQ

Vital capacity of lung is ________.

A

IRV + ERV + TV + RV

B

IRV + ERV + TV – RV

C

IRV + ERV + TV

D

IRV + ERV

Question 14: Palette 14/51

NEET 2022 MCQ

Identify the region of human brain which has pneumotaxic centre that alters respiratory rate by reducing the duration of inspiration.

A

Cerebrum

B

Medulla

C

Pons

D

Thalamus

Question 15: Palette 15/51

NEET 2022 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

(a) and (e)

B

(b), (d) and (e)

C

(a), (c) and (d)

D

(a), (c) and (e)

Question 16: Palette 16/51

NEET 2022 MCQ

Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver ____________ ml of O₂ to the tissues.

A

2 ml

B

5 ml

C

4 ml

D

10 ml

Question 17: Palette 17/51

NEET 2022 MCQ

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

A

It clears inhaled air from foreign particles

B

Inhaled air is humidified

C

Temperature of inhaled air is brought to body temperature

D

Provides surface for diffusion of O₂ and CO₂

Question 18: Palette 18/51

NEET 2021 MCQ

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

A

Low pO₂, low pCO₂, more H⁺, higher temperature

B

High pO₂, low pCO₂, less H⁺, lower temperature

C

Low pO₂, high pCO₂, more H⁺, higher temperature

D

High pO₂, high pCO₂, less H⁺, higher temperature.

Question 19: Palette 19/51

NEET 2021 MCQ

The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are :

A

pO₂ = 159 and pCO₂ = 0.3

B

pO₂ = 104 and pCO₂ = 40

C

pO₂ = 40 and pCO₂ = 45

D

pO₂ = 95 and pCO₂ = 40

Question 20: Palette 20/51

NEET 2021 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 false but (R) is true

B

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

C

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

D

(A) is true but (R) is false

Question 21: Palette 21/51

NEET 2020 MCQ

Select the correct events that occur during inspiration.
(i) Contraction of diaphragm
(ii) Contraction of external inter-costal muscles
(iii) Pulmonary volume decreases
(iv) Intra pulmonary pressure increases

A

Only (iv)

B

(iii) and (iv)

C

(i), (ii) and (iv)

D

(i) and (ii)

Question 22: Palette 22/51

NEET 2020 MCQ

Identify the wrong statement with reference to transport of oxygen.

A

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

B

Partial pressure of CO₂ can interfere with O₂ binding with haemoglobin

C

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

D

Low pCO₂ in alveoli favours the formation of oxyhaemoglobin

Question 23: Palette 23/51

NEET 2019 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

2200 mL

B

2700 mL

C

1500 mL

D

1700 mL

Question 24: Palette 24/51

NEET 2018 MCQ

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

A

Decreased respiratory surface; Inflammation of bronchioles

B

Inflammation of bronchioles; Decreased respiratory surface

C

Increased number of bronchioles; Increased respiratory surface

D

Increased respiratory surface; Inflammation of bronchioles

Question 25: Palette 25/51

NEET 2018 MCQ

Which of the following is an occupational respiratory disorder?

A

Botulism

B

Anthracis

C

Silicosis

D

Emphysema

Question 26: Palette 26/51

NEET 2018 MCQ

Match the items given in column I with those in column II and select the correct option given below.

Column I	Column II
A. Tidal volume	(i) 2500 – 3000 mL
B. Inspiratory reserve volume	(ii) 1100 – 1200 mL
C. Expiratory reserve volume	(iii) 500 – 550 mL
D. Residual volume	(iv) 1000 – 1100 mL

A

A $ \to $ (iii), B $ \to $ (i), C $ \to $ (iv), D $ \to $ (ii)

B

A $ \to $ (iv), B $ \to $ (iii), C $ \to $ (ii), D $ \to $ (i)

C

A $ \to $ (iii), B $ \to $ (ii), C $ \to $ (i), D $ \to $ (iv)

D

A $ \to $ (i), B $ \to $ (iv), C $ \to $ (ii), D $ \to $ (iii)

Question 27: Palette 27/51

NEET 2017 MCQ

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

A

inspiratory reserve volume

B

tidal volume

C

expiratory reserve volume

D

residual volume.

Question 28: Palette 28/51

NEET 2016 MCQ

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

A

three is a negative pressure in the lungs

B

there is a negative intrapleural pressure pulling at the lung walls

C

there is a positive intrapleural pressure

D

pressure in the lungs is higher than the atmospheric pressure.

Question 29: Palette 29/51

NEET 2016 MCQ

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

A

equal to that in the blood

B

more than that in the blood

C

less than that in the blood

D

less than that of carbon dioxide.

Question 30: Palette 30/51

NEET 2016 MCQ

Name the chronic repiratory disorder caused mainly by cigarette smoking.

A

Respiratory acidosis

B

Respiratory alkalosis

C

Emphysema

D

Asthma

Question 31: Palette 31/51

NEET 2016 MCQ

Asthma may be attributed to

A

inflammation of the trachea

B

accumulation of fluid in the lungs

C

bacterial infection of the lungs

D

allergic reaction of the mast cells in the lungs.

Question 32: Palette 32/51

NEET 2016 MCQ

Reduction in pH of blood will

A

decrease the affinity of haemoglobin with oxygen

B

release bicarbonate ions by the liver

C

reduce the rate of heart beat

D

reduce the blood supply to the brain.

Question 33: Palette 33/51

NEET 2015 MCQ

Name the pulmonary disease in which alveolar surface area involved in gas exchage is drastically reduced due to damage in the alveolar walls.

A

Pneumonia

B

Asthma

C

Pleurisy

D

Emphysema

Question 34: Palette 34/51

NEET 2015 MCQ

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

A

Falling CO₂ concentration

B

Rising CO₂ and falling O₂ concentration

C

Falling O₂ concentration

D

Rising CO₂ concentration

Question 35: Palette 35/51

NEET 2014 MCQ

Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs

A

as bicarbonate ions

B

in the from of dissolved gas molecules

C

by binding to R.B.C.

D

as carbamino - haemoglobin.

Question 36: Palette 36/51

NEET 2013 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

A - Trachea - Long tube supported by complete cartilaginous rings for conducting inspired air.

B

C - Alveoli - Thin walled vascular bag like structures for exchange of gases.

C

B - Pleural membrane - Surround ribs on both sides to provide cushion against rubbing.

D

D - Lower end of lungs - Diaphragm pulls it down during inspiration.

Question 37: Palette 37/51

NEET 2012 MCQ

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

A

have more RBCs and their haemoglobin has a lower binding affinity to O₂

B

are not physically fit to play games like football

C

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

D

have the usual RBC count but their haemoglobin has very high binding affinity to O₂.

Question 38: Palette 38/51

NEET 2012 MCQ

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

A

Cigarette smoking may lead to inflammation of bronchi.

B

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

C

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

D

About 90% of carbon dioxide (CO₂) is carried by haemoglobin as carbamino-haemoglobin.

Question 39: Palette 39/51

NEET 2011 MCQ

Bulk of carbon dioxide (CO₂) released from body tissues into the blood is present as

A

bicarbonate in blood plasma and RBCs

B

free CO₂ in blood plasma

C

70% carbamino-haemoglobin and 30% as bicarbonate

D

carbamino-haemoglobin in RBCs.

Question 40: Palette 40/51

NEET 2011 MCQ

Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

A

One can breathe out air totally without oxygen.

B

One can breathe out air through Eustachian tube by closing both nose and mouth.

C

One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all.

D

The lungs can be made fully empty by forcefully breathing out all air from them.

Question 41: Palette 41/51

NEET 2011 MCQ

A large proportion of oxygen remains unused in the human blood even after its uptake by the body tissues. This O₂

A

acts as a reserve during muscular exercise

B

raises the pCO₂ of blood to 75 mm of Hg.

C

is enough to keep oxyhaemoglobin saturation at 96%

D

helps in releasing more O₂ to the epithelial tissues.

Question 42: Palette 42/51

NEET 2011 MCQ

The figure given below shows a small part of human lung where exchange of gases takes place. Select the option which represents labelled part (A, B, C or D) correctly identified along with its function.

A

D : capillary wall - exchange of O₂ and CO₂ takes place here

B

B : red blood cells - transport of CO₂ mainly.

C

A : alveolar cavity - main site of exchange of respiratory gases

D

C : arterial capillary - passes oxygen to tissues

Question 43: Palette 43/51

NEET 2010 MCQ

Listed below are four respiratory capacities (i $-$ iv) and four jumbled respiratory volumes of a normal human adult.

	Respiratory capacities		Respiratory volumes
(i)	Residual volume		2500 mL
(ii)	Vital capacity		3500 mL
(iii)	Inspiratory reserve volume		1200 mL
(iv)	Inspiratory capacity		4500 mL

Which one of the following is the correct matching of two capacities and volumes?

A

(ii) 2500 mL,   (iii) 4500 mL

B

(iii) 1200 mL,   (iv) 2500 mL

C

(iv) 3500 mL,   (i) 1200 mL

D

(i) 4500 mL,   (ii) 3500 mL

Question 44: Palette 44/51

NEET 2010 MCQ

What is true about RBCs in humans?

A

They carry about 20-25 percent of CO₂.

B

They transport 99.5 percent of O₂.

C

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

D

They do not carry CO₂ at all.

Question 45: Palette 45/51

NEET 2009 MCQ

The haemoglobin of a human foetus

A

has only 2 protein subunits instead of 4

B

has a higher affinity for oxygen than that of an adult

C

has a lower affinity for oxygen than that of the adult

D

its affinity for oxygen is the same as that of an adult.

Question 46: Palette 46/51

NEET 2009 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 volum plus tidal volume

D

Total lung capacity minus expiratory reserve volume

Question 47: Palette 47/51

NEET 2006 MCQ

Which one of the following statements is incorrect?

A

The principle of countercurrent flow facilitates efficient respiration in gills of fishes.

B

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

C

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

D

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

Question 48: Palette 48/51

NEET 2006 MCQ

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at altitude to 5400 metres have around 8 million. This is because at high altitude

A

people eat more nutritive food, therefore more RBCs are formed

B

people get pollution-free air to breath and more oxygen is available

C

atmospheric O₂ level is less and hence more RBCs are needed to absorb the required amount of O₂ to survive

D

there is more UV radiation which enhances RBC production.

Question 49: Palette 49/51

NEET 2006 MCQ

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

A

attached to haemoglobin

B

dissolved in the blood

C

as bicarbonates

D

as carbonates.

Question 50: Palette 50/51

NEET 2004 MCQ

Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct?
The patient has been inhaling polluted air containing unusually high content of

A

carbon disulphide

B

chloroform

C

carbon dioxide

D

carbon monoxide.

Question 51: Palette 51/51

NEET 2004 MCQ

When CO₂ concentration in blood increases breathing becomes

A

shallower and slow

B

there is no effect on breathing

C

slow and deep

D

faster and deeper