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Capillaries and red blood cells. Coloured scanning electron micrograph (SEM) of a freeze-fractured sample of tissue containing capillaries, some of which contain red blood cells (erythrocytes). A capillary is the smallest type of blood vessel, often only just large enough for red blood cells to pass through. Red blood cells (erythrocytes) are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells. The oxygen transfer occurs in capillaries, where carbon dioxide is also removed and then taken to the lungs for exhalation. Magnification: x2000 when printed at 10 centimetres across.
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