Muscle 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 · Muscle physiology

Sample item

What is the effect of increased preload on stroke volume within normal limits?

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

The answer and the reasoning

D. Increases stroke volume

Within physiological limits, increased preload stretches cardiac fibers and increases stroke volume through the Frank-Starling mechanism.

Option by option

  • A. Stops contraction

    Normal preload changes do not stop myocardial contraction.

  • B. Eliminates heart rate

    Preload does not eliminate the role of heart rate in cardiac output.

  • C. Decreases venous return

    Preload generally reflects increased, not decreased, venous return.

  • D. Increases stroke volume (correct)

    Correct: increased preload raises stroke volume via Frank-Starling physiology.

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, Increases stroke volume. Within physiological limits, increased preload stretches cardiac fibers and increases stroke volume through the Frank-Starling mechanism.

Why is "Stops contraction" not the answer?

Normal preload changes do not stop myocardial contraction.

Why is "Eliminates heart rate" not the answer?

Preload does not eliminate the role of heart rate in cardiac output.

Why is "Decreases venous return" not the answer?

Preload generally reflects increased, not decreased, venous return.

What concept does this question test?

It tests Muscle physiology in Physiology. The correct option holds because: Correct: increased preload raises stroke volume via Frank-Starling physiology.

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 Muscle 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.