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Platelets are irregularly-shaped, colorless forms that are available in blood. Their sticky surface lets them to form clots to stop bleeding.

When bleeding from a wound starts, the platelets accumulate at the wound and try to block the blood stream. The calcium, vitamin K, & a protein called fibrinogen help the platelets to form coagulation.

A clot starts to form when the blood is in contact with air. The platelets sense the existence of air and start to separate. They respond with the fibrinogen to start forming fibrin, which looks like fiber. The fibrin then starts to structure a web-like work that traps the platelets inside it. This cross section of platelets solidifies as it dries, shaping a coagulation, or "scab."

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