Autonomic drugs: practice question

A Pharmacology 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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Pharmacology · Autonomic drugs

Sample item

What is the principal effect of muscarinic M3 activation in bronchi?

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

The answer and the reasoning

C. Bronchoconstriction and increased secretions

M3 receptor activation contracts bronchial smooth muscle and stimulates airway secretions, effects opposed by antimuscarinic bronchodilators.

Option by option

  • A. Tachycardia through SA node

    SA-node tachycardia relates to vagal M2 blockade.

  • B. Bronchodilation

    Bronchodilation is mainly beta-2 mediated.

  • C. Bronchoconstriction and increased secretions (correct)

    Correct: M3 is the parasympathetic airway receptor.

  • D. Reduced glandular secretion

    M3 increases secretions.

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.

More Pharmacology questions

Questions about this Pharmacology question

What is the answer to this Pharmacology question?

The best answer is C, Bronchoconstriction and increased secretions. M3 receptor activation contracts bronchial smooth muscle and stimulates airway secretions, effects opposed by antimuscarinic bronchodilators.

Why is "Tachycardia through SA node" not the answer?

SA-node tachycardia relates to vagal M2 blockade.

Why is "Bronchodilation" not the answer?

Bronchodilation is mainly beta-2 mediated.

Why is "Reduced glandular secretion" not the answer?

M3 increases secretions.

What concept does this question test?

It tests Autonomic drugs in Pharmacology. The correct option holds because: Correct: M3 is the parasympathetic airway receptor.

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 drugs?

Learn drugs as classes, then the exception in each class that an examiner would pick. Then use the flashcards and the other Pharmacology 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.