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platelets.JPG Image from a light microscope (40×) from a
peripheral blood smear surrounded by red blood cells. One normal
platelet can be seen in the upper left side of the image
(purple) and is significantly smaller in size than the red blood
cells (stained pink). Two giant platelets (stained purple) are
also visible. Latin thrombocytes Code TH H2. 3D Rendering of
Platelets  Platelets, or thrombocytes (from Greek θρόμβος,
"clot" and κύτος, "cell"), are small, disc shaped clear cell
fragments (i.e., cells that do not have a nucleus), 2–3 µm in
diameter,[1] 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.       •
The physiological range for platelets is (150 – 40