Haemostasis: 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 · Haemostasis

Sample item

What is the main role of platelets in primary haemostasis?

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

The answer and the reasoning

C. Form an initial platelet plug at vascular injury

Platelets adhere to exposed subendothelial structures, activate, and aggregate to create an initial plug; the coagulation cascade subsequently generates fibrin to stabilize this primary haemostatic response.

Option by option

  • A. Convert fibrinogen directly into fibrin

    Thrombin converts fibrinogen to fibrin during secondary haemostasis.

  • B. Dissolve established clots

    Fibrinolysis dissolves clots through plasmin activity.

  • C. Form an initial platelet plug at vascular injury (correct)

    Correct: platelets create the first plug at a damaged vessel.

  • D. Transport oxygen to tissues

    Erythrocytes, not platelets, are the main oxygen carriers.

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 C, Form an initial platelet plug at vascular injury. Platelets adhere to exposed subendothelial structures, activate, and aggregate to create an initial plug; the coagulation cascade subsequently generates fibrin to stabilize this primary haemostatic response.

Why is "Convert fibrinogen directly into fibrin" not the answer?

Thrombin converts fibrinogen to fibrin during secondary haemostasis.

Why is "Dissolve established clots" not the answer?

Fibrinolysis dissolves clots through plasmin activity.

Why is "Transport oxygen to tissues" not the answer?

Erythrocytes, not platelets, are the main oxygen carriers.

What concept does this question test?

It tests Haemostasis in Physiology. The correct option holds because: Correct: platelets create the first plug at a damaged vessel.

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 Haemostasis?

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.