Thrombocytes or platelets are cells that play an important role in stopping bleeding. The word thrombocyte comes from the Greek "thrombos" meaning a "thick drop" or clot, and "cyte" means cell. If a blood vessel is damaged, thrombocytes line the wall of the vessel. The thrombocytes clump together into a ball. This process is called aggregation. Eventually a clot forms and that stops the bleeding.

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