Blood from wound site, SEM

Blood from wound site, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Red blood cells and platelets. Coloured scanning electon micrograph (SEM) of human erythrocytes (red blood cells) and a platelet aggregate (yellow). Platelets are fragments of white blood cells that under normal circumstances are small and biconcave in form. However, if there is a break in the surface of a blood vessel the platelets come into contact with molecules they are not used to and become activated. They become amorphous in form, with long projections (pseudopodia) that help them adhere to other cells and each other, forming a clot. Magnification: x4000 when printed at 10 centimetres wide.

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Keywords: anatomical, anatomy, biconcave, biological, biology, blood, blood cells, cell, cell biology, cells, cgi, circulatory system, coloured, coloured scanning electron micrograph, digitally generated, erythrocyte, erythrocytes, false-coloured, haemoglobin, hemoglobin, human, human blood cells, magnification, magnified, oxygen transport, physiological, physiology, rbc, rbcs, red blood cell, red blood cells, respiratory system, scanning electron micrograph, scanning electron microscope, sem, three dimensional, vascular, wound

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