Neurophysiology: 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 · Neurophysiology

Sample item

What ion influx produces the rapid depolarization of a typical neuron?

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

The answer and the reasoning

B. Sodium influx

The relevant Neurophysiology principle makes Sodium influx the best answer because it directly explains the structure or physiological response in the stem.

Option by option

  • A. Potassium influx

    Potassium influx does not correspond to the structure or response being tested.

  • B. Sodium influx (correct)

    Correct. Sodium influx directly follows from the core neurophysiology relationship.

  • C. Calcium efflux

    Calcium efflux is associated with a different anatomical or physiological role.

  • D. Chloride efflux

    Chloride efflux is not supported by the key clue provided in this item.

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.

More Physiology questions

Questions about this Physiology question

What is the answer to this Physiology question?

The best answer is B, Sodium influx. The relevant Neurophysiology principle makes Sodium influx the best answer because it directly explains the structure or physiological response in the stem.

Why is "Potassium influx" not the answer?

Potassium influx does not correspond to the structure or response being tested.

Why is "Calcium efflux" not the answer?

Calcium efflux is associated with a different anatomical or physiological role.

Why is "Chloride efflux" not the answer?

Chloride efflux is not supported by the key clue provided in this item.

What concept does this question test?

It tests Neurophysiology in Physiology. The correct option holds because: Correct. Sodium influx directly follows from the core neurophysiology relationship.

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 Neurophysiology?

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.