Red blood cells

Credit: CHRISTIAN DARKIN/SCIENCE PHOTO LIBRARY

Caption: Red blood cells. Computer artwork of red blood cells in a blood vessel. 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. The red colour comes from the oxygen- carrying protein haemoglobin. Red blood cells are the most abundant cell in the blood. They have no nucleus and are about 7 micrometres in diameter.

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