Autonomic 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 · Autonomic physiology

Sample item

Which effect follows sympathetic activation at beta-1 receptors in the heart?

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

The answer and the reasoning

A. Increased heart rate and contractility

Beta-1 receptor stimulation increases sinoatrial firing and myocardial contractility and also promotes renin release from juxtaglomerular cells.

Option by option

  • A. Increased heart rate and contractility (correct)

    Correct: beta-1 stimulation raises chronotropy and inotropy.

  • B. Reduced renin release from kidney

    Beta-1 stimulation increases rather than reduces renin release.

  • C. Pupillary constriction

    Pupil constriction is parasympathetic.

  • D. Bronchial smooth-muscle contraction

    Bronchodilation is mediated mainly by beta-2 receptors.

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, Increased heart rate and contractility. Beta-1 receptor stimulation increases sinoatrial firing and myocardial contractility and also promotes renin release from juxtaglomerular cells.

Why is "Reduced renin release from kidney" not the answer?

Beta-1 stimulation increases rather than reduces renin release.

Why is "Pupillary constriction" not the answer?

Pupil constriction is parasympathetic.

Why is "Bronchial smooth-muscle contraction" not the answer?

Bronchodilation is mediated mainly by beta-2 receptors.

What concept does this question test?

It tests Autonomic physiology in Physiology. The correct option holds because: Correct: beta-1 stimulation raises chronotropy and inotropy.

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 Autonomic 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.