18.5 MB (1.8 MB compressed)
2842 x 2281 pixels
24.1 x 19.3 cm ⏐ 9.5 x 7.6 in (300dpi)
VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
Blood clot. Coloured scanning electron micrograph (SEM) of a human blood clot caused by an injury or disease. The clot consists of threads of fibrin, an insoluble protein. These form a mesh that traps blood cells and seals the damaged blood vessel to prevent bleeding. Blood clots are triggered by chemicals released either by platelet cells in the blood or by tissue cells at the injury site. These chemicals begin a complex series of chemical reactions in the blood that result in the formation of fibrin. Magnification unknown.
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