Coloured SEM of white blood cells and platelets

Coloured SEM of 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 brown) play a role in the body's immune response. At centre and far left are smaller platelets (thrombocytes, coloured yellow). 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, images, immune, leucocyte, leukocyte, magnified image, microscopic photos, platelet, subjects, thrombocyte, white, white bl, white blood, white blood cel, white blood cell

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