Reproduction: emergency contraception: 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 · Reproduction: emergency contraception

Sample item

A woman takes levonorgestrel 1.5 mg within 24 hours of unprotected intercourse in mid-cycle. What is its main mechanism?

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

The answer and the reasoning

D. Delay or inhibition of ovulation by blunting the LH surge

Levonorgestrel acts mainly by delaying or preventing ovulation, taken before the LH surge. It is not effective after ovulation has occurred and does not disrupt an established pregnancy.

Option by option

  • A. Destruction of the corpus luteum

    It does not destroy the corpus luteum.

  • B. Immobilisation of sperm in the cervix

    Sperm immobilisation is the mechanism associated with a copper device, not levonorgestrel.

  • C. Dislodgement of an implanted blastocyst

    It does not act on an implanted pregnancy.

  • D. Delay or inhibition of ovulation by blunting the LH surge (correct)

    Correct. Its main effect is to delay or inhibit the LH surge and ovulation.

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, Delay or inhibition of ovulation by blunting the LH surge. Levonorgestrel acts mainly by delaying or preventing ovulation, taken before the LH surge.

Why is "Destruction of the corpus luteum" not the answer?

It does not destroy the corpus luteum.

Why is "Immobilisation of sperm in the cervix" not the answer?

Sperm immobilisation is the mechanism associated with a copper device, not levonorgestrel.

Why is "Dislodgement of an implanted blastocyst" not the answer?

It does not act on an implanted pregnancy.

What concept does this question test?

It tests Reproduction: emergency contraception in Physiology. It is not effective after ovulation has occurred and does not disrupt an established pregnancy.

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 Reproduction: emergency contraception?

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.