False-colour SEM early clot formation in

False-colour SEM early clot formation in

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Credit: PROF. P. MOTTA/DEPT. OF ANATOMY/UNIVERSITY "LA SAPIENZA", ROME/SCIENCE PHOTO LIBRARY

Caption: Early stage of blood clot formation: false-colour scanning electron micrograph (SEM) showing an aggregation of red blood cells on the endocardium, the lining of the heart. Clotting is a repair process signalled by the release of thromboplastin from platelets (a type of blood cell) and injured endothelial cells. The formation of a clot, a mesh of blood cells bound by threads of fibrin, is a complex multi-step process. No fibrin is visible at this early stage. Red cells sometimes tend to align into columns (rouleaux formation), due to surface tension effects. Magnification: x210 at 6x7cm size.

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Keywords: anatomy, blood, clot formation, endocardium, endothelium, erythrocyte, false-coloured, heart, human body, images, in heart, magnified image, microscopic photos, process, red blood cell, red blood cell and, subjects

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