White blood cells and platelets

White blood cells and platelets

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: White blood cells & platelets. Coloured scanning electron micrograph (SEM) of a group of white blood cells (leucocytes) and activated platelets in human blood. The larger rounded white blood cells (coloured pink, light blue) play a role in the body's immune response. At centre and far left are smaller platelets (thrombocytes, dark blue). Platelets are non-nucleated cells found in large numbers in the blood. When inactive they are round or oval discs; activated they have dendritic processes, or pseudopodia (as seen here), and they may become star-shaped. When activated, platelets clump together and are involved in blood clotting. Magnification: unknown.

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Keywords: activated platelet, anatomy, blood cell, blood platelet, cells, human body, immune, leucocyte, leukocyte, platelet, thrombocyte, white, white bl, white blood, white blood cel, white blood cell

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