Blood platelets

Patent Granted Platelets, also called "thrombocytes", are a component of blood whose function (along with the coagulation factors) is to stop bleeding by clumping and clogging blood vessel injuries. [1] Platelets have no cell nucleus: they are fragments of cytoplasm which are derived from the megakaryocytes[2] of the bone marrow, and then enter the circulation. These unactivated platelets are biconvex discoid (lens-shaped) structures,[3][4] 2–3 µm in greatest diameter.