[eli5] how do platelets help in blood clotting?
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When an injury causes a blood vessel to break, platelets (a type of blood cell) are activated and begin to stick to the injury site. As more platelets stick to the site, they form a plug. This plug helps stop the bleeding by clogging the hole in the blood vessel.
Platelets activate at the site of a blood vessel injury and expand into a tangle of fibers that trap other blood cells. Those fibers are what holds the clot together.
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