«Platelets, also called thrombocytes (from Greek θρόμβος, "clot" and κύτος, "cell"), are a component of blood whose function (along with the coagulation factors) is to react to bleeding from blood vessel injury by clumping, thereby initiating a blood clot.[1] Platelets have no cell nucleus: they are fragments of cytoplasm that are derived from the megakaryocytes[2] of the bone marrow, and then enter the circulation. Circulating unactivated platelets are biconvex discoid (lens-shaped) structures,[3][4]:117–18 2–3 µm in greatest diameter.[5] Activated platelets have cell membrane projections covering their surface. Platelets are found only in mammals, whereas in other animals (e.g. birds, amphibians) thrombocytes circulate as intact mononuclear cells.[4]:3

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Modified: 4 months ago on May 17, 2019
personMoreVitaminov 17 lvl added it 5 months ago on Apr 27, 2019.