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Neural Control And Coordination

460 Questions Start Allen Test
All Exams Allen Errorless
Q376 Allen SPINAL CORD, PNS, ANS MCQ
Five events in the transmission of nerve impulse across the synapse are given below A. Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post-synaptic neuron. B. Neurotransmitter binds to the receptor on post synaptic membrane C. Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter releases into synaptic cleft. D. Depolarization of pre-synaptic membrane E. Arrival of action potential at axon terminal. In which sequence to the events occur?
A.
E ā†’ D ā†’ C ā†’ B ā†’ A
B.
A ā†’ B ā†’ C ā†’ D ā†’ E
C.
A ā†’ B ā†’ D ā†’ C ā†’ E
D.
E ā†’ D ā†’ C ā†’ A ā†’ B
Q377 Allen SPINAL CORD, PNS, ANS MCQ
Which of the following is a motor nerve ?
A.
Auditory
B.
Abducens
C.
Optic
D.
Trigeminal nerve
Q378 Allen SPINAL CORD, PNS, ANS MCQ
Which one of the following is not an effect of sympathetic nervous system ā€“
A.
Dilation of pupil
B.
Inhibition of peristalsis
C.
Elevation of blood pressure
D.
Stimulation for saliva secretion
Q379 Allen REFLEX ACTION MCQ
The following diagrammatic representation of reflex action shows knee jerk reflex. In which of the following options corrects words for all the 5 blanks (A to E) are indicated?
A.
A-Dorsal root ganglion, B-White matter, C-Gray matter, D-Afferent pathway
B.
A-Dorsal root ganglion, B-White matter, C-Interneuron, D-Afferent pathway
C.
A-Dorsal root ganglion, B-Gray matter, C-White matter, D-Efferent pathway
D.
A-Ventral root ganglion, B-White matter, C-Interneuron, D-Efferent pathway
Q380 Allen REFLEX ACTION MCQ
Reflex action is controlled by :-
A.
Muscles
B.
Limbs
C.
Central nervous system
D.
Autonomic nervous system
Q381 Allen REFLEX ACTION MCQ
Find out the correct sequence of a simple reflex are :-
A.
Brain-spinal cord - nerves - effector
B.
Effector - CNS - sensory nerves - receptor
C.
Muscles - spinal cord - brain - receptor
D.
Receptor - sensory nerves - CNS - effector
Q382 Allen REFLEX ACTION MCQ
Sight of delicious food usually makes mouth watery, it is a :-
A.
Hormonal response
B.
Neural response
C.
Optic response
D.
Olfactory response
Q383 Allen REFLEX ACTION MCQ
Reflex arc consists of :
A.
Motor nerve
B.
Sensory nerve
C.
Both sensory and motor nerves
D.
None of these
Q384 Allen PYQ MCQ
Which one of the following statements is correct?
A.
Neither hormones control neural activity nor the neuron control endocrine activity
B.
Endocrine glands regulate neural activity, but not vice versa
C.
Neurons regulate endocrine activity, but not vice versa
D.
Endocrine glands regulate neural activity, and nervous system regulates endocrine glands
Q385 Allen PYQ MCQ
Which one of the following does not act as a neurotransmitter?
A.
Norepinephrine
B.
Cortisone
C.
Acetylcholine
D.
Epinephrine
Q386 Allen PYQ MCQ
During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?
A.
First positive, then negative and continue to be negative
B.
First negative, then positive and continue to be positive
C.
First positive, then negative and again back to positive
D.
First negative, then positive and again back to negative
Q387 Allen PYQ MCQ
Which one of the following pairs of structures distinguishes a nerve cell from other types of cell?
A.
Vacuoles and fibres
B.
Flagellum and medullary sheath
C.
Nucleus and mitochondria
D.
Perikaryon and dendrites
Q388 Allen PYQ MCQ
During the propagation of a nerve impulse, the action potential results from the movement of :
A.
Kāŗ from intracellular fluid to extracellular fluid
B.
Naāŗ from extracellular fluid to intracellular fluid
C.
Kāŗ from extracellular fluid to intracellular fluid
D.
Naāŗ from intracellular fluid to extracellular fluid
Q389 Allen PYQ MCQ
The nerve centres which control the body temperature and the urge for eating are contained in:
A.
Cerebellum
B.
Thalamus
C.
Hypothalamus
D.
Pons
Q390 Allen PYQ MCQ
A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neuro-hormonal control system?
A.
Hypothalamus activates the parasympathetic division of brain
B.
Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal cortex
C.
Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla
D.
Neurotransmitters diffuses rapidly across the synaptic cleft and transmit a nerve impulse
Q391 Allen PYQ MCQ
A diagram showing axon terminal and synapse is given below. Identify correctly at least two of A-D.
A.
C-Neurotransmitter, D-Ca++
B.
A-Receptor, C-Synaptic vesicles
C.
B-Synaptic connection, D-K+
D.
A-Neurotransmitter, B-Synaptic cleft
Q392 Allen PYQ MCQ
How do parasympathetic neural signals affect the working of the human heart ?
A.
Reduce both heart rate and cardiac output.
B.
Heart rate is increased without affecting the cardiac output.
C.
Both heart rate and cardiac output increase.
D.
Heart rate decreases but cardiac output increases.
Q393 Allen PYQ MCQ
Injury localized to the hypothalamus would most likely to disrupt :
A.
short - term memory.
B.
co-ordination during locomotion.
C.
executive functions, such as decision making.
D.
regulation of body temperature.
Q394 Allen PYQ MCQ
Which of the following regions of the brain is incorrectly paired with its function?
A.
Cerebellum- language comprehension
B.
Corpus callosum-communication between the left and right cerebral cortex
C.
Cerebrum- calculation and contemplation
D.
Medulla oblongata - homeostatic control
Q395 Allen PYQ MCQ
Myelin sheath is produced by:
A.
Astrocytes and Schwann cells
B.
Oligodendrocytes and Osteoclasts
C.
Osteoclasts and Astrocytes
D.
Schwann cells and Oligodendrocytes
Q396 Allen PYQ MCQ
Receptor sites for neurotransmitters are present on:
A.
Pre-synaptic membrane
B.
Tips of axons
C.
Post-synaptic membrane
D.
Membrane of synaptic vesicles
Q397 Allen PYQ MCQ
Which of the following structures or regions is incorrectly paired with its function?
A.
Medulla oblongata, Controls respiration and cardiovascular reflexes.
B.
Limbic system, Consists of fibre tracts that interconnect different regions of brain; controls movement.
C.
Hypothalamus, Production of releasing hormones and regulation of temperature, hunger and thirst.
D.
Corpus callosum,Band of fibres connecting left and right cerebral hemispheres.
Q398 Allen PYQ MCQ
Which part of the brain is responsible for thermoregulation?
A.
Cerebrum
B.
Hypothalamus
C.
Corpus callosum
D.
Medulla oblongata
Q399 Allen PYQ MCQ
Which of the following statements is not correct?
A.
An action potential in an axon does not move backward because the segment behind is in a refractory phase
B.
Depolarisation of hair cells of cochlea
results in the opening of the mechanically
gated potassium -ion channels.
C.
Rods are very sensitive and contribute to
daylight vision.
D.
In the knee-jerk reflex, stimulus is the
stretching of muscle and response is its
contraction.
Q400 Allen PYQ MCQ
Select the incorrect statement regarding synapses: an electrical synapse.
A.
Electrical current can flow directly from one neuron into the other across the
B.
Chemical synapses use neurotransmitters
C.
Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.
D.
The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse.