POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes, red) and white blood cells (leucocytes, grey). The disc- shaped erythrocytes transport oxygen to the body cells and remove carbon dioxide to the lungs. The leucocytes are part of the immune system, defending the body against infection by digesting pathogens or secreting antibodies. Magnification: x2600 at 6x7cm size.
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