Blood clot

Blood clot

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Caption: Blood clot. Coloured scanning electron micrograph (SEM) of a blood clot in a human artery. The clot consists of threads of fibrin (yellow), an insoluble protein. These form a mesh which traps blood cells (red) and seals the damaged blood vessel to prevent bleeding. Blood clots are triggered by chemicals released 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 which result in the formation of fibrin. An abnormal clot (thrombus) can also occur in intact blood vessels, and is the principal cause of heart attack and stroke. Magnification: x1,900 at 5x7cm size. x950 at 35mm size.

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Keywords: anatomy, blood, blood clot, clot, fibrin, human body, in blood clot, process, thrombus

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