Respiration: 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.

Try it

Physiology · Respiration

Sample item

What is the main stimulus for ventilation in healthy adults?

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

The answer and the reasoning

B. Carbon dioxide

This item reviews Respiration; Carbon dioxide is the best answer because it directly fits the anatomical or physiological relationship described.

Option by option

  • A. Hemoglobin only

    Hemoglobin only is plausible but is not the best answer.

  • B. Carbon dioxide (correct)

    Correct. Carbon dioxide matches the defining feature.

  • C. Oxygen only

    Oxygen only does not match the stated relationship.

  • D. Sodium

    Sodium is not supported by the key finding.

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, Carbon dioxide. This item reviews Respiration; Carbon dioxide is the best answer because it directly fits the anatomical or physiological relationship described.

Why is "Hemoglobin only" not the answer?

Hemoglobin only is plausible but is not the best answer.

Why is "Oxygen only" not the answer?

Oxygen only does not match the stated relationship.

Why is "Sodium" not the answer?

Sodium is not supported by the key finding.

What concept does this question test?

It tests Respiration in Physiology. The correct option holds because: Correct. Carbon dioxide matches 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 Respiration?

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.