False-col SEM of mass of human blood platelets

False-col SEM of mass of human blood platelets

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Credit: PHOTO INSOLITE REALITE/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph (SEM) of a mass of human blood platelets (thrombocytes). Platelets are small, non-nucleated cells formed in the bone marrow, and are present in circulating blood in large numbers. Their shape in an unactivated state is round or oval (2-3 micrometres diameter); activated platelets have dendritic processes, or pseudopodia. Platelets function in 2 ways. Firstly, they help plug defects in the walls of small blood vessels: secondly, they are involved in clotting & also release serotonin, which reduces blood flow by constricting damaged vessels. Magnification: x2,000 at 6x7cm, x1000 at 35mm size.

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Keywords: activated, activated platelet, anatomy, blood, clotting, human body, platelet, platelets, thrombocyte

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