Both the intrinsic and extrinsic pathways converge on activation of what factor, which then activates prothrombin?

Question

Quizplus · Accepted Answer

Factor X is the common pathway for both the intrinsic and extrinsic pathways of blood coagulation. It is activated by factor VIIa in the extrinsic pathway and by factor IXa in the intrinsic pathway. Activated factor X then activates prothrombin to thrombin, which converts fibrinogen to fibrin, leading to the formation of a blood clot.

Both the Intrinsic and Extrinsic Pathways Converge on Activation of What