Platelet aggregation is an important event in haemostasis. Which of the following statement is true for platelet aggregation in vascular injury?

Correct Answer: C

Rationale: Platelets change shape (C, true) from discoid to spiky during aggregation, aiding clot formation. Initial vasoconstriction occurs (A, false), clotting factors enhance aggregation (B, false), serotonin contributes mildly (D, true but not primary), and thromboxane A2 promotes, not inhibits (E, false)—C is key.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.