Give the mechanism of blood coagulation. Discuss the role of vitamin K in coagulation.

Blood coagulation, also known as hemostasis, is a complex process that involves a series of reactions and interactions between proteins and cells in the blood. The main purpose of blood coagulation is to prevent excessive bleeding after injury, while at the same time preventing the formation of unwanted blood clots inside blood vessels.

The mechanism of blood coagulation can be divided into two main pathways: the intrinsic pathway and the extrinsic pathway. These pathways converge on a common pathway that leads to the formation of a blood clot.

The intrinsic pathway begins with the activation of factor XII, which is present in the blood plasma. Once _____ ________ ___ ___ ____.
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