Nerve physiology: practice question

A Physiology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Physiology · Nerve physiology

Sample item

Why does myelination increase nerve conduction velocity?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. It enables saltatory conduction between nodes

Myelin insulates internodal membrane so depolarization jumps between nodes of Ranvier, greatly increasing the speed and efficiency of impulse conduction.

Option by option

  • A. It removes all ion channels

    Nodes retain critical ion channels.

  • B. It enables saltatory conduction between nodes (correct)

    Correct: node-to-node conduction is faster.

  • C. It increases axon diameter to infinity

    Axon size is not made infinite.

  • D. It prevents repolarization

    Repolarization still occurs.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Physiology question

What is the answer to this Physiology question?

The best answer is B, It enables saltatory conduction between nodes. Myelin insulates internodal membrane so depolarization jumps between nodes of Ranvier, greatly increasing the speed and efficiency of impulse conduction.

Why is "It removes all ion channels" not the answer?

Nodes retain critical ion channels.

Why is "It increases axon diameter to infinity" not the answer?

Axon size is not made infinite.

Why is "It prevents repolarization" not the answer?

Repolarization still occurs.

What concept does this question test?

It tests Nerve physiology in Physiology. The correct option holds because: Correct: node-to-node conduction is faster.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Nerve physiology?

For each system, sketch the key graph (pressure–volume loop, oxygen dissociation curve, nephron handling) and explain it aloud. Then use the flashcards and the other Physiology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.