Neurons: 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 · Neurons

Sample item

What causes action-potential repolarization?

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

The answer and the reasoning

D. Potassium efflux

This item reviews Neurons; Potassium efflux is the best answer because it directly matches the anatomical or physiological relationship described.

Option by option

  • A. Sodium influx

    Sodium influx does not fit the stated relationship.

  • B. Chloride pump

    Chloride pump is unsupported by the key finding.

  • C. Calcium influx only

    Calcium influx only is plausible but not the best answer.

  • D. Potassium efflux (correct)

    Correct. Potassium efflux fits the defining feature.

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 D, Potassium efflux. This item reviews Neurons; Potassium efflux is the best answer because it directly matches the anatomical or physiological relationship described.

Why is "Sodium influx" not the answer?

Sodium influx does not fit the stated relationship.

Why is "Chloride pump" not the answer?

Chloride pump is unsupported by the key finding.

Why is "Calcium influx only" not the answer?

Calcium influx only is plausible but not the best answer.

What concept does this question test?

It tests Neurons in Physiology. The correct option holds because: Correct. Potassium efflux fits the defining feature.

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 Neurons?

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.