Nerve Conduction and Excitability
- Previous year questions on Nerve Conduction and Excitability for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Physiology section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 8 live questions in Nerve Conduction and Excitability.
- Physiology is worth about 17 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 19 Aug 2026.
Q1.A politician is shot in the back during a rally at level of T8 vertebral immediately after the shot he loses all the sensation below level of lesion. Chance of regeneration of spinal cord due to the fact that injured nerve is not able to regenerate is due to reason all except:
- ALack of endoneural tubes
- BLack of growth factors
- CPresence of glial scar
- DLack of myelin inhibiting substance✓ Correct answer
Q2.Which of the following is TRUE about propagated nerve action potential?
- ADecremental
- BNot affected by hypoxia✓ Correct answer
- CFastest in C fibers
- DNot affected by membrane capacitance
Q3.Which of the following is not true for myelinated nerve fibers:
- AImpulse through myelinated fibers is slower than non-myelinated fibers✓ Correct answer
- BMembrane currents are generated at nodes of Ranvier
- CSaltatory conduction of impulses is seen
- DLocal anesthesia is effective only when the nerve is not covered by myelin sheath
Q4.Property affected due to diameter of nerve fiber/axon?
- AConduction velocity✓ Correct answer
- BRefractory period
- CLatency period
- DAmplitude
Q5.If sodium channel inactivation is prolonged then which property of nerve conduction is hampered?
- ADecreased relative refractory period
- BIncreased conduction blockade✓ Correct answer
- CIncreased upward stroke velocity
- DDecreased downward stroke velocity of refractory period.
Q6.Rapid axonal flow in the neurons is mediated by all except:
- ADynein
- BKinesin
- CNeurofilaments✓ Correct answer
- DMicrotubules
Q7.Axonal transport is:
- AAntegrade
- BRetrograde
- CAntegrade and retrograde✓ Correct answer
Q8.Myelinated nerve fibres have all of the following properties except
- AConduction is slower in myelinated than in non-myelinated fibres✓ Correct answer
- BCurrent discharges at nodes of Ranvier
- COuter layer is of lipids
- DDepolarisation occurs only at nodes of ranvier
Answer key
Q1: D. Lack of myelin inhibiting substance; Q2: B. Not affected by hypoxia; Q3: A. Impulse through myelinated fibers is slower than non-myelinated fibers; Q4: A. Conduction velocity; Q5: B. Increased conduction blockade; Q6: C. Neurofilaments; Q7: C. Antegrade and retrograde; Q8: A. Conduction is slower in myelinated than in non-myelinated fibres.
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