POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Red and white blood cells. Coloured scanning electron micrograph (SEM) showing two types of human blood cells. Red blood cells (or erythrocytes, red) and a white blood cell (or leucocyte, white) can be seen. Red blood cells are biconcave disc-shaped cells which transport oxygen around the body. Their red colour comes from the oxygen-carrying protein haemoglobin. The single rounded white blood cell has microvilli projecting from its surface. White blood cells of different types are active in the body's immune response to infection. Magnification: x3,100 at 5x7cm size.
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