For 10 points, name this process by which blood clots.
The formation of tenase complex is key to this process, and one variant of a disorder in which it does not occur properly is called Christmas disease. This process is promoted by a protein named for Hageman, and VKORC is inhibited by the drug warfarin in order to prevent it. This process is initiated upon the exposure and binding to (*) collagen of von Willebrand factor. Factor II, also known as thrombin, promotes this process by cleaving fibrinogen to create fibrin, a protein that polymerizes and enmeshes platelets. For 10 points, name this process by which blood clots.
The formation of tenase complex is key to this process, and one variant of a disorder in which it does not occur properly is called Christmas disease.
{coagulation} [accept blood {clotting} before mention; accept {logical} equivalents]