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 structure is the normal primary cardiac pacemaker?

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

The answer and the reasoning

A. Sinoatrial node

The sinoatrial node has the fastest spontaneous depolarization rate under normal conditions and therefore sets the heart's rhythm.

Option by option

  • A. Sinoatrial node (correct)

    Correct: SA node normally initiates cardiac rhythm.

  • B. Bundle branches

    Bundle branches conduct impulses through ventricles.

  • C. Atrioventricular node

    AV node delays conduction and can act as a slower backup pacemaker.

  • D. Purkinje fibers

    Purkinje fibers rapidly distribute ventricular activation.

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, Sinoatrial node. The sinoatrial node has the fastest spontaneous depolarization rate under normal conditions and therefore sets the heart's rhythm.

Why is "Bundle branches" not the answer?

Bundle branches conduct impulses through ventricles.

Why is "Atrioventricular node" not the answer?

AV node delays conduction and can act as a slower backup pacemaker.

Why is "Purkinje fibers" not the answer?

Purkinje fibers rapidly distribute ventricular activation.

What concept does this question test?

It tests Cardiovascular physiology in Physiology. The correct option holds because: Correct: SA node normally initiates cardiac rhythm.

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.