Respiratory 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 · Respiratory physiology

Sample item

What is surfactant's principal action in alveoli?

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

The answer and the reasoning

A. Reduces surface tension

The core Respiratory physiology relationship supports Reduces surface tension; it is the response that directly accounts for the structural location or physiological change described.

Option by option

  • A. Reduces surface tension (correct)

    Correct. Reduces surface tension is directly supported by the central clue.

  • B. Blocks oxygen diffusion

    Blocks oxygen diffusion does not fulfill the structural or functional role requested.

  • C. Increases mucus production

    Increases mucus production is associated with a different respiratory physiology relationship.

  • D. Constricts bronchioles

    Constricts bronchioles is not consistent with the key finding in the stem.

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 A, Reduces surface tension. The core Respiratory physiology relationship supports Reduces surface tension; it is the response that directly accounts for the structural location or physiological change described.

Why is "Blocks oxygen diffusion" not the answer?

Blocks oxygen diffusion does not fulfill the structural or functional role requested.

Why is "Increases mucus production" not the answer?

Increases mucus production is associated with a different respiratory physiology relationship.

Why is "Constricts bronchioles" not the answer?

Constricts bronchioles is not consistent with the key finding in the stem.

What concept does this question test?

It tests Respiratory physiology in Physiology. The correct option holds because: Correct. Reduces surface tension is directly supported by the central clue.

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 Respiratory 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.