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Factor V is a clotting factor produced mainly in the liver. It circulates in the blood plasma in an inactive form. When activated, it combines with factor X on the surface of platelets. This combination significantly speeds up the conversion of prothrombin into thrombin, a crucial step in the blood clotting process. Blood clotting, or coagulation, is a complex mechanism involving platelets, endothelial cells, and blood-clotting proteins to prevent excessive bleeding after injury. Factor V is one of several plasma components essential for this process.123

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