Red blood cell and platelet SEM

Platelets, or thrombocytes  are small, irregularly 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. They circulate in the blood  and are involved in hemostasis, leading to the formation of blood clots. (adapted from wikipedia)

Credit David Gregory & Debbie Marshall, Wellcome Images  SEM of platelet and red blood corpuscle 

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