Cardiovascular 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 · Cardiovascular physiology

Sample item

What is the Frank-Starling mechanism describing?

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

The answer and the reasoning

B. Greater ventricular filling increases contraction strength within limits

Within physiological limits, greater end-diastolic filling stretches cardiac fibres and increases force of contraction, matching output to venous return.

Option by option

  • A. Faster nerve conduction after myelination

    Myelination affects nerve conduction, not ventricular preload.

  • B. Greater ventricular filling increases contraction strength within limits (correct)

    Correct: preload-dependent force helps balance right and left heart outputs.

  • C. Increased alveolar oxygen diffusion

    Alveolar diffusion is a respiratory mechanism.

  • D. Reduced renal sodium reabsorption

    Renal sodium handling is a separate regulatory process.

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, Greater ventricular filling increases contraction strength within limits. Within physiological limits, greater end-diastolic filling stretches cardiac fibres and increases force of contraction, matching output to venous return.

Why is "Faster nerve conduction after myelination" not the answer?

Myelination affects nerve conduction, not ventricular preload.

Why is "Increased alveolar oxygen diffusion" not the answer?

Alveolar diffusion is a respiratory mechanism.

Why is "Reduced renal sodium reabsorption" not the answer?

Renal sodium handling is a separate regulatory process.

What concept does this question test?

It tests Cardiovascular physiology in Physiology. The correct option holds because: Correct: preload-dependent force helps balance right and left heart outputs.

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 Cardiovascular 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.