JIM DOWDALLS / SCIENCE PHOTO LIBRARY JIM DOWDALLS / SCIENCE PHOTO LIBRARY
Red and white blood cells. Illustration of red blood cells (erythrocytes, red) and white blood cells (leucocytes, pale pink & purple). Red blood cells are biconcave disc-shaped cells which transport oxygen around the body. Their red colour comes from the oxygen-carrying protein haemoglobin. White blood cells are active in the body's immune response to infection.
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