Metabolism and Other Biochemical Reactions

How does blood clotting take place?

Platelets in the blood send a message to constrict blood vessels in the area surrounding a wound. Platelets gather to block the flow of blood coming out. At the same time, a chemical messenger called prothrombin activates an enzyme called thrombin, which then produces a species called fibrin. Fibrin forms threads to block the wound even better.


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