Platelets in a blood clot

Platelets in a blood clot

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Platelets in a blood clot. Coloured scanning electron micrograph (SEM) of platelet cells (thrombocytes) in a blood clot. They are oval shaped, but when they meet damaged blood vessels they become activated - releasing chemical factors and turning into spiky spheres. The chemical factors cause fibrinogen to come out of solution as fibrin fibres, catching platelets and other blood cells and eventually forming a solid clot. Magnification: x4600 when printed 10 centimetres wide.

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Keywords: biological, biology, blood cell, blood cells, blood clot, blood vessel, clotting, physiological, physiology, platelet, platelets, scanning electron micrograph, sem, thrombocyte, thrombocytes, thrombus

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