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This involves the clotting mechanism.

There are two pathways the intrinsic pathway and the extrinsic pathway. The intrinsic pathway is caused by a damaged surface. The extrinsic pathway is caused by trauma. It has a number of steps. Each step involves an enzyme or factor. Prothrombin changes to thrombin. Fibrinogen changes to fibrin. That produces a cross-linked fibrin clot. This blocks further bleeding.

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