DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Red blood cells. Computer artwork of red blood cells spilling from a torn blood vessel. Red blood cells are the most abundant blood cell in humans. Made in the bone marrow, the cells are small, circular discs without nuclei. They are biconcave in shape, giving them a large surface area for exchange of gases. Red blood cell cytoplasm is almost entirely made up of haemoglobin which gives the cells their colour. The haemoglobin takes up oxygen as the blood passes through the lungs and releases it when the blood passes through the tissues. The red blood cells also take carbon dioxide from the body back to the lungs.
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