40.2 MB (4.0 MB compressed)
4341 x 3238 pixels
36.8 x 27.4 cm ⏐ 14.5 x 10.8 in (300dpi)
NIBSC / SCIENCE PHOTO LIBRARY NIBSC / SCIENCE PHOTO LIBRARY
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.
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