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50.0 MB (3.4 MB compressed)
4501 x 3883 pixels
38.1 x 32.8 cm ⏐ 15.0 x 12.9 in (300dpi)
EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Capillary and red blood cells. Coloured scanning electron micrograph (SEM) of a freeze-fractured sample of tissue containing a capillary which contains some 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: x6700 when printed at 10 centimetres across.
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