A neuron is the structural and functional unit of the nervous system, specialised to receive, conduct and transmit electrical signals. Its cell body, or soma, contains the nucleus and cytoplasm with granular bodies called Nissl granules; short, tapering dendrites carry signals toward the soma, and a single long axon carries the impulse away from it, ending in branched **axon te
Neural Control and Coordination
Class 116 previous-year questions from this chapter every option and the correct answer, free · where the marks are
1. Neuron, nerve impulse and synapse
Exam focus: Chemical synapses transmit in one direction only, since neurotransmitter is released solely from pre-synaptic vesicles and received solely by post-synaptic receptors, while the much rarer electrical synapse allows current to pass either way. The resting potential itself (about -70 mV, inside negative) is maintained by the Na+-K+ pump moving 3 Na+ out for every 2 K+ in, a ratio that's easy to invert in an option.
Neural Control and Coordination — Full Chapter (Neuron, Nerve Impulse and Synapse)
PW NEET
A roughly two-hour chapter one-shot with PYQs; neuron structure and the synapse are covered early.
ZoologyNEET 2022show ▾Select the incorrect statement regarding synapses:
- A.Impulse transmission across a chemical synapse is always faster than that across an electrical synapse✓
- B.The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse
- C.Electrical current can flow directly from one neuron into the other across the electrical synapse
- D.Chemical synapses use neurotransmitters
The worked solution is part of a paid pack.
2. Central nervous system
Exam focus: NEET separates "initiates movement" from "coordinates movement": the cerebrum's motor areas initiate voluntary movement, so damage there causes paralysis, while the cerebellum only fine-tunes posture, balance and precision, so damage to it produces jerky, uncoordinated movement, not paralysis — the give-away in assertion-reason questions on this topic.
Neural Control and Coordination — Full Chapter (Central Nervous System)
PW NEET
Same chapter one-shot; the CNS and PNS are covered midway through.
ZoologyNEET 2024show ▾Given below are two statements:
Statement I: The cerebral hemispheres are connected by a nerve tract known as the corpus callosum.
Statement II: The brain stem consists of the medulla oblongata, pons and cerebrum.
In the light of the above statements, choose the most appropriate answer from the options given below:
- A.Both Statement I and Statement II are incorrect.
- B.Statement I is correct but Statement II is incorrect.✓
- C.Statement I is incorrect but Statement II is correct.
- D.Both Statement I and Statement II are correct.
Solution
The corpus callosum is the tract joining the two cerebral hemispheres (Statement I true). The brain stem is the midbrain, pons and medulla — not the cerebrum — so Statement II is false.
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Save for spaced revision (free account)ZoologyNEET 2024show ▾Match List I with List II.
List I List II A. Pons I. Provides additional space for neurons, regulates posture and balance B. Hypothalamus II. Controls respiration and gastric secretions C. Medulla III. Connects different regions of the brain D. Cerebellum IV. Neurosecretory cells
Choose the correct answer from the options given below:
- A.A-III, B-IV, C-II, D-I✓
- B.A-I, B-III, C-II, D-IV
- C.A-II, B-I, C-III, D-IV
- D.A-II, B-III, C-I, D-IV
Solution
The pons connects different regions of the brain (III); the hypothalamus carries neurosecretory cells (IV); the medulla controls respiration and gastric secretions (II); the cerebellum regulates posture and balance (I).
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Save for spaced revision (free account)ZoologyNEET 2023show ▾The parts of the human brain that help in the regulation of sexual behaviour, expression of excitement, pleasure, rage, fear etc. are:
- A.Limbic system and hypothalamus✓
- B.Corpora quadrigemina and hippocampus
- C.Brain stem and epithalamus
- D.Corpus callosum and thalamus
The worked solution is part of a paid pack.
ZoologyNEET 2023show ▾Match List I with List II with respect to the human eye.
List I List II A. Fovea I. Visible coloured portion of the eye that regulates the diameter of the pupil B. Iris II. External layer of the eye formed of dense connective tissue C. Blind spot III. Point of greatest visual acuity or resolution D. Sclera IV. Point where the optic nerve leaves the eyeball and photoreceptor cells are absent
Choose the correct answer from the options given below:
- A.A-III, B-I, C-IV, D-II✓
- B.A-IV, B-III, C-II, D-I
- C.A-I, B-IV, C-III, D-II
- D.A-II, B-I, C-III, D-IV
The worked solution is part of a paid pack.
ZoologyNEET 2019show ▾Which part of the brain is responsible for thermoregulation?
- A.Cerebrum
- B.Hypothalamus✓
- C.Corpus callosum
- D.Medulla oblongata
The worked solution is part of a paid pack.
3. Reflex action
Exam focus: The specific trap is timing: a spinal reflex arc completes its receptor-to-effector loop through the spinal cord alone, so the hand is already withdrawn before the pain signal has finished travelling up to the brain for conscious perception. The sensation of pain is felt after the reflex action, not before or during it — exactly the sequence NEET's reflex-arc questions check.
Neural Control and Coordination — Full Chapter (Reflex Action)
PW NEET
Same chapter one-shot; reflex action is covered near the end.