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

Question

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Both the intrinsic and extrinsic pathways of the blood coagulation cascade converge on the activation of Factor X. Once activated, Factor X (along with its cofactor Factor V, in the presence of calcium and phospholipids) forms the prothrombinase complex, which then activates prothrombin to thrombin.

Both the Intrinsic and Extrinsic Pathways Converge on Activation of What