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Blood clot, SEM
Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot (thrombus) in an arteriole (small blood vessel). Red blood cells (erythrocytes, red) are trapped within a fibrin protein mesh (thread-like), which is formed in response to chemicals secreted by platelets, fragments of white blood cells (blue). Clots are formed in response to cardiovascular disease or injuries to blood vessels. Magnification: x3000 when printed 10 centimetres wide., by STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
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