Blood from wound site, SEM

Blood from wound site, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Human blood cells, Coloured scanning electron micrograph (SEM) of a variety of blood cells from the site of an early skin wound. Red blood cells and a white blood cell as well as activated platelets (yellow) forming a clot are present. Platelets are tiny blood cells that help the body form clots to stop bleeding. If a blood vessels gets damaged, it sends out signals that are picked up by platelets. The platelets then rush to the site of damage and form a plug, or clot, to repair the damage. The process of spreading across the surface of a damaged blood vessel to stop bleeding is called adhesion. This is because when platelets get to the site of the injury, they grow sticky tentacles that help them adhere. They also send out chemical signals to attract more platelets to pile onto the clot in a process called aggregation. Magnification: x2500 when printed 10cm wide.

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Keywords: biological, biology, blood cell, cardiovascular disease, cell, cells, clot, clotted, clotting, coagulated, coagulating, coagulation, coloured, crenated, crenating, echinocytes, erythrocyte, erythrocytes, false-colour, false-coloured, fibre, fibres, fresh clot, haematological, haematology, hematological, hematology, histological, histology, immune system, immunological, immunology, injury, leucocyte, leucocytes, leukocytes, new, physiological, physiology, poikilocyte, protein, rbc, red blood cell, scanning electron micrograph, scanning electron microscope, sem, staunching, thrombosis, thrombus, wbc, white blood cell, wound

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