出典:Wikipedia
出典:『Wikipedia』 (2011/07/11 22:37 UTC 版)
Platelets, or thrombocytes (from Greek θρόμβος, "clot" and κύτος, "cell"), are small, regularly shaped clear cell fragments (i.e. cells that do not have a nucleus containing DNA), 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.
splanchnotomy
procathedral
the main vein
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