Blood platelets

Blood platelets

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Caption: Blood platelets. Coloured scanning electron micro- graph (SEM) of activated blood platelets. Platelet cells (thrombocytes) are formed in the bone marrow, and circulate in the bloodstream in large numbers. When unactivated they are round/oval, whereas activated platelets develop pseudopodia or extensions from the cell wall as seen here. Platelets function in two ways: they plug defects in the walls of damaged blood vessels, and they are involved in the clotting of blood. They also release serotonin which constricts blood vessels. Magnification: x3,300 at 6x6cm size.

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Keywords: activated, active, anatomy, blood, circulation, circulatory system, clotting, haematology, healthy, hematology, histology, human biology, human body, normal, platelet, platelets, scanning electron micrograph, sem, thrombocyte

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