BSIP, SERCOMI / SCIENCE PHOTO LIBRARY BSIP, SERCOMI / SCIENCE PHOTO LIBRARY
Blood cells. Coloured transmission electron micrograph (TEM) of sectioned red blood cells (red) and three white blood cells (blue). Red blood cells (erythrocytes) are biconcave, disc- shaped cells that transport oxygen from the lungs to body cells. They circulate around the body in the blood and also remove carbon dioxide to the lungs for exhalation. Various cross-sections of this pliable, elastic cell are seen. White blood cells (leucocytes) are part of the immune system, defending the body against infection. They can engulf foreign organisms or release chemicals to destroy them. The type shown here have lobed nuclei (dark blue). Magnification unknown.
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