Red blood cells. Coloured scanning electron micrograph (SEM) of human red blood cells (erythrocytes). These biconcave, disc-shaped cells transport oxygen from the lungs to body cells. They also remove carbon dioxide to the lungs for exhalation. Their red colour comes from the oxygen-carrying protein haemoglobin. Red blood cells are the most abundant cell in the blood. Magnification: x7200 at 6x7cm size.
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