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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

Noun
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
BUKHARI'S MAGIC LAB
150-450x1000000000/L
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.
ATIS
Platelets Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Platelets, or thrombocytes (from Greek θρόμβος, "clot" and κύτος, "cell"), are small, disk 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.

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