51.5 MB (3.1 MB compressed)
4572 x 3937 pixels
38.6 x 33.3 cm ⏐ 15.2 x 13.1 in (300dpi)
STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Blood clot. Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes, red) clumped together with fibrin (blue) to form a blood clot. The fibrin mesh is formed in response to chemicals secreted by platelets, fragments of white blood cells. A thrombus can form due to blood disorders, or excessive time spent in a cramped position. If the thrombus detaches from the blood vessel wall, it may travel to other parts of the body and disrupt the blood flow there. A thrombus can be fatal if it blocks blood flow to a vital organ, such as the heart, lung, or brain. Magnification: x500 when printed at 10 centimetres wide.
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