AIIMS AIPMT JIPMER MCAT – Human Neural System Practice Questions

1. A touch on the right hand stimulates neurons in the
(a) left somatic sensory area
(b) left occipital lobe
(c) right somatic sensory area
(d) right occipital lobe.
2. Tree of life is
(a) branchial tree (b) lymphatic system (c) arbor vitae (d) loop of Henle.
3. Which of the following options illustrates the distribution of Na+ and K* ions in a section of non-myelinated axon which is at resting potential?

non-myelinated-axon4. Which one of the following does not act as a neurotransmitter?
(a) Cortisone (b) Acetylcholine
(c) Epinephrine (d) Norepinephrine
5. Cerebellum of brain is concerned with the
(a) contraction of voluntary muscles
(b) co-ordinating and regulating tone
(c) maintaining posture, orientation and equilibrium of body
(d) all of these.
6. All sensory information to be registered consciously by the fore-brain must pass via the
(a) thalamus
(b) reticular activating system
(c) cerebellum (d) pons.
7. Afferent nerve fibre carries impulses from
(a) effector to central nervous system
(b) receptor to central nervous system
(c) central nervous system to muscle
(d) central nervous system to receptors.
8. A list of events occurring in the transmission of nerve impulse across the synapse is given below in a random order.
(i) Opening of specific ion channels allows the entry of ions, a new action potential is generated in the post- synaptic neuron.
(ii) Neurotransmitter binds to the receptor on post synaptic membrane
(iii) Synaptic vesicle fuses with pre-synaptic membrane, neurotransmitter release into synaptic cleft
(iv) Depolarization of pre-synaptic membrane
(v) Arrival of action potential at axon terminal
Which of the following options represents these events in a correct order?
(a) <v) —> (iv) —> (iii) —> (ii) —> (i)
(b) (i) (ii) -»(iii) -»(iv) -»(v)
(c) (i)—> (ii) (iv) —> (iii) —> (v)
(d) (v) > (iv) (iii) -> (i) -> (ii)
9. In a medullated nerve fibre, the conduction of impulse is faster due to the presence of
(a) pericytes
(b) endoneurium and epineurium
(c) myelin sheath and nodes of Ranvier
(d) Nissl’s granules
10. Which of the following statements are correct regarding Na+ – K* pump ?
(i) Needs energy (ATP) to work
(ii) Expels 3 Na+ for every 2K* ions imported
(iii) Works against a concentration gradient
(iv) Maintains resting potential
(a) (i)and(iv) (b) (ii) and (iii)
(c) (i) and (iii) (d) All of these
11. Which of the following has H-shaped grey matter ?
(a) Cerebrum (b) Medulla oblongata
(c) Cerebellum (d) Spinal cord
12. In a man, abducens nerve is injured. Which one of the following functions will be affected?
(a) Movement of the eyeball
(b) Movement of the tongue
(c) Swallowing
(d) Movement of the neck.
13. In a human being, the number of spinal nerves is
(a) 31 pairs (b) 52 pairs
(c) 12 pairs (d) 36 pairs.
14. The area in brain which is associated with strong emotions is
(a) cerebral cortex (b) cerebellum
(c) limbic system (d) medulla.
15. Resting membrane potential is maintained by
(a) hormones
(b) neurotransmitters
(c) ion pumps
(d) none of these.
16. An investigator places an isolated neuron in a calcium-free medium, gives the neuron a suprathreshold stimulus and then performs an assay to test whether neurotransmitter is released into the medium. Which of the following outcomes would you predict?
(a) No neurotransmitter is detected since influx of calcium into the synaptic knob is required for neurotransmitter release.
(b) No neurotransmitter is detected since influx of calcium is required in order for the neuron to conduct an action potential.
(c) Neurotransmitter is detected since calcium is not required for action potential conduction and the initial stimulus was suprathreshold.
(d) We cannot predict the outcome without knowing whether the neuron was myelinated.
17. Among the following characteristics, indicate the correct combinations applicable to conditioned reflex action.
P. Acquired by practice or learning.
Q. Not acquired by birth.
R. Does not abolish by lack of practice.
S. Participation of cerebral cortex.
T. Originates spontaneously.
(a) P, Q, R (b) P, Q, S
(c) P,R,T (d) Q, R, T
18. Vagus nerve is a
(a) mixed Xth cranial nerve
(b) mixed XIth cranial nerve
(c) mixed Xth thoracic nerve
(d) sensory X(h cranial nerve.
19. Match Column -I with column – II and select the correct option from the codes given below.

120. Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
(a) nerve fibre is insulated by a medullary sheath
(b) sodium pump starts operating only at the cyton and then continues into the nerve fibre
(c) neurotransmitters are released by dendrites and not by axon endings
(d) neurotransmitters are released by the axon endings and not by dendrites.
21. Parkinson’s disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control, and make use of neurotransmitter
(a) acetylcholine (b) norepinephrine
(c) dopamine (d) GABA.
22. ‘Pons’ connects the
(a) two cerebral hemispheres
(b) two lobes of cerebellum
(c) cerebrum and cerebellum
(d) spinal cord with the brain.
23. What is the space between arachnoid and piamater called?
(a) Supra-arachnoid space
(b) Sub-arachnoid space
(c) Subdural space (d) Meninges
24. Reflex arc consists of
(a) motor nerve
(b) sensory nerve
(c) both sensory and motor nerves
(d) none of the above
25. The sympathetic nerves in mammals, arise from
(a) sacral nerves
(b) thoraco-lumbar nerves
(c) cervical nerves
(d) 3rd, 7th, 9th and 10th cranial nerves.

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