NREMT Advanced-EMT Practice Test

Thromboxane A2 primarily promotes which process in heostasis?

Promotes platelet aggregation Inhibits platelet aggregation Causes vasodilation Reduces coagulation factors

Correct Answer:

Promotes platelet aggregation

Explanation:

Thromboxane A2 is a mediator released by activated platelets that amplifies the platelet response and helps form a hemostatic plug. It stimulates platelets to activate and aggregate, promoting the sticking together of platelets to seal a damaged vessel. It also causes vasoconstriction at the injury site to reduce blood flow and limit bleeding. Because of these actions, its primary effect is promoting platelet aggregation, not inhibiting it, causing vasodilation, or reducing coagulation factors.

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