Question

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multiple choice question
as platelets aggregate during the second step of hemostasis (shown in this picture), of the following events occur?

prostacyclin and collagen is released from the platelets.

pus accumulates within the blood vessels.

platelets degranulate resulting in release of thromboxane a, adp and serotonin.

Explanation:

1. Analyze the first option: Prostacyclin is an inhibitor of platelet aggregation, and collagen is from damaged endothelium, not released by platelets during aggregation. So this is incorrect.
2. Analyze the second option: Pus accumulation is related to infection/inflammation (pus is from dead neutrophils, bacteria, etc.), not hemostasis (platelet aggregation step). So this is incorrect.
3. Analyze the third option: During platelet aggregation (second step of hemostasis), platelets degranulate, releasing substances like thromboxane A₂ (promotes aggregation), ADP (attracts more platelets), and serotonin (vasoconstriction and platelet activation). This matches the process.

Answer:

Platelets degranulate resulting in release of thromboxane A, ADP and serotonin.