Blood cells, SEM

Blood cells, SEM

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Credit: POWER AND SYRED/SCIENCE PHOTO LIBRARY

Caption: Blood cells. Coloured scanning electron micrograph (SEM) of human red blood cells (erythrocytes) and a single white blood cell (leucocyte). Red blood cells are biconcave, giving them a large surface area for gas exchange, and highly elastic, enabling them to pass through narrow capillary vessels. The cell's interior is packed with haemoglobin, a red iron-containing pigment that has an oxygen-carrying capacity. The main function of red blood cells is to distribute oxygen to body tissues and to carry waste carbon dioxide back to the lungs. White blood cells are part of the body's immune system and fight invading pathogens. Magnification: x4300 when printed at 10 centimetres wide.

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Keywords: biconcave, biological, biology, cell, cells, coloured, erythrocyte, false-coloured, human, human body, leucocyte, leukocyte, many, multiple, people, person, rbc, red blood cell, scanning electron micrograph, scanning electron microscope, sem, white blood cell

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