Coloured TEM of a section through blood platelets

Active platelets. Coloured transmission electron micrograph (TEM) of a section through activated blood platelets. Platelet cells (thrombocytes) are formed in the bone marrow, and circulate in blood in large numbers. In an unactivated state they are round/oval, whereas activated platelets develop pseudopodia or extensions from the cell wall. Platelets contain cytoplasmic organelles such as mitochondria (green), endoplasmic reticulum and granules (dark blue). Platelets function in two ways: they plug defects in the walls of blood vessels, and are involved in clotting. They also release serotonin which constricts blood vessels. Magnification: x17, 700 at 6x7cm size. x57, 000 at 8x10'. Stunning Photo Gifts From Science Photo Library

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