SEM of activated blood platelets

SEM of activated blood platelets

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Credit: NIBSC/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph of activated blood platelets on the surface of damaged endothelium. Platelets, or thrombocytes, are small, non-nucleated cells formed in the bone marrow. They occur in the blood in large numbers. In an unactivated state they are shaped like round or oval wafers 2-3 micrometres in diameter (see photo P256/012); activated platelets have dendritic processes, or pseudopodia. Platelets function in 2 ways: they help plug defects in the walls of small blood vessels; and they are involved in blood clotting and in the release of serotonin, which reduces blood flow by constricting damaged vessels. Magnification: x3600 at 6x4.5cm size.

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Keywords: activated, activated platelet, anatomy, blood, clotting, human body, platelet, platelets, scanning electron micrograph, sem, thrombocyte

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