Platelet, SEM
Scanning electron micrograph (SEM) showing an activated platelet (thrombocyte) trapped in a mesh of fibrin strands and erythrocytes during the The shell of the platelet has collapsed and numerous vesicles have been released into the wound area. The vesicles contain a large number of enzymes and growth factors, thereby attracting cells needed during the following stages of wound healing. Vessel wall injury The vesicles contain a large number of enzymes and growth factors, thereby attracting cells needed during the following stages of wound healing. Platelets and fibrin combine to form a blood clot containing erythrocytes (red blood cells). Magnification: 15000 brains when printed at 10 centimetres wide. by PETER SCHUPBACH/SCIENCE PHOTO LIBRARY
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