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Definition of Platelets

Babylon English

small cytoplasmic body in the blood that aids in clotting, blood platelet
Platelets Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

1. tiny bits of protoplasm found in vertebrate blood; essential for blood clotting
(synonym) blood platelet, thrombocyte
(hypernym) protoplasm, living substance
Platelets Definition from Medicine Dictionaries & Glossaries
Dictionary of Medicine (Shahram)
Platelets are irregular disc-shaped elements of the blood which assist in blood clotting. Other major blood elements include protein, serum and red and white blood cells. Although platelets are classed as blood cells, they are not. They are fragments of a large cells called megakaryocytes (literally, large cells).
Glossary of HIV/AIDS-Related Terms
Active agents of inflammation when damage occurs to a blood vessel. They are not actually cells, but fragments released by megakaryocyte cells. Megakaryocyte is a large cell in the bone marrow whose function is to produce platelets. When vascular damage (i.e., damage to blood vessels) occurs, the platelets stick to the vascular walls, forming clots to prevent the loss of blood. Thus, it is important to have adequate numbers of normally functioning platelets to maintain effective coagulation (clotting) of the blood. There are drugs that can potentially alter the platelet count, making it necessary to monitor the count. Also, some persons living with HIV develop thrombocytopenia -- a condition characterized by a platelet count of less than 100,000 platelets per cubic millimeter of blood. The normal value for men is 154,000-354,000 platelets per cubic millimeter of blood. For women, it is 162,000-380,000 platelets per cubic millimeter of blood.
Platelets Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Platelets, also called thrombocytes ( + , "blood clot cell"), are a component of blood whose function (along with the coagulation factors) is to stop bleeding by clumping and clotting blood vessel injuries. Platelets have no cell nucleus: they are fragments of cytoplasm that are derived from the megakaryocytes of the bone marrow, and then enter the circulation. These unactivated platelets are biconvex discoid (lens-shaped) structures, 2–3 µm in greatest diameter. Platelets are found only in mammals, whereas in other animals (e.g. birds, amphibians) thrombocytes circulate as intact mononuclear cells.

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