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Blood Clots. Blood clotting, or coagulation, is an important process that prevents excessive bleeding when a blood vessel is injured. Platelets (a type of blood cell) and proteins in your plasma (the liquid part of blood) work together to stop the bleeding by forming a clot over the injury.
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Because you would bleed to death if you didn't have blood clots. Clotting help block so not as much blood leaves the body. It also protects from infection and bacteria.