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The action of platelets are triggered by any blood loss (internal and external) and they concentrate (move) in the area of loss rapidly, beginning the clotting (and eventually, healing) process.
Injury causes damaged tissue cells to produce prothrombin activator. This, along with clotting factor produced by the sticky platelets at the damaged site, cause prothrombin + calcium to make thrombin.
All the while fibrinogen is stimulated to make fibrin. The fibrin ensnares RBCs to form the clot with the platelets. All factors have to be there for the clotting to occur. Lack of any of them causes bleeding disorders.
You can say that the circulatory system is the major part of the clotting system.

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