Clotting factor II combines with clotting factor X in the presence of Ca²⁺to form the active enzyme prothrombinase.

Question

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Clotting factor II, also known as prothrombin, is converted into thrombin by the action of the prothrombinase complex, which is formed by the combination of clotting factor X (factor Xa) and clotting factor V in the presence of calcium ions (Ca2+) on phospholipid surfaces, not by combining directly with factor X.

Clotting Factor II Combines with Clotting Factor X in the Presence