What is platelet?

  • (noun): Tiny bits of protoplasm found in vertebrate blood; essential for blood clotting.
    Synonyms: blood platelet, thrombocyte


Platelets, or thrombocytes (from Greek θρόμβος, "clot" and κύτος, "cell"), are small, irregularly shaped clear cell fragments (i.e. cells that do not have a nucleus), 2–3 µm in diameter, which are derived from fragmentation of precursor megakaryocytes. The average lifespan of a platelet is normally just 5 to 9 days. Platelets are a natural source of growth factors. They circulate in the blood of mammals and are involved in hemostasis, leading to the formation of blood clots.

Read more about Platelet.

Some articles on platelet:

Cerastocytin - Function Overview
... While all hemotoxins leading to clot formation induce in platelet aggregation, they do so in various ways ... von Willebrand factor (vWF) by inducing it to bind to platelet glycoprotein Ib (GPIb) thereby providing the surface for initial platelet aggregation ... Like thrombin, these proteases are capable of inducing platelet aggregation, and some even fibrin clot formation, at nanomolar concentrations ...
Cerastocytin - Inhibition
... Just as with thrombin, cerastocytin-activated platelet aggregation is inhibited by chlorpromazine, theophylline and mepacrine ... clot formation even though both have been observed to inhibit thrombin-facilitated platelet clot formation ... This data suggests that cerastocytin has distinct sites for platelet and fibrinopeptide binding because the two functions could be inhibited independently of each other ...
Autotransfusion - Platelet Sequestration and Autologous Platelet Gel
... of blood into three groups red cells, platelet poor plasma, and platelet rich plasma ... The red cells and platelet poor plasma can be given back to the patient through intravenous transfusion during or after surgery ... The platelet rich plasma can be mixed with calcium and thrombin to create a product known as autologous platelet gel ...
Platelet Adhesiveness
... Platelet adhesiveness refers to the processes or factors which lead to the adhesion of platelets to other structures ... It can be contrasted with platelet aggregation, which refers to the processes or factors which lead to the adhesion of platelets to other platelets ...