STEVE GSCHMEISSNER / CAROL UPTON / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / CAROL UPTON / SCIENCE PHOTO LIBRARY
Abnormal blood clot. Coloured transmission electron micrograph (TEM) of a section through a blood vessel that is blocked by an abnormal blood clot (thrombus). Blood should not normally clot in a blood vessel. 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.
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