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Thrombocytes, commonly known as platelets, are small, disc-shaped cell fragments in blood that lack a nucleus in humans. They are produced from megakaryocytes in the bone marrow and enter circulation as anucleate particles about 2–3 micrometers in diameter. In healthy adults, platelet counts typically range from about 150 to 450 x 10^9 per liter, and platelets have a lifespan of roughly 7 to 10 days, with a portion stored in the spleen.
Platelets play a central role in hemostasis, the process that stops bleeding. Upon vascular injury, they adhere
Development and variation are notable: platelets are anucleate in mammals, whereas many other vertebrates have nucleated