False-colour SEM of human red blood cells

False-colour SEM of human red blood cells

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Credit: DR TONY BRAIN/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph (SEM) of human red blood cells, or erythrocytes. Erythrocytes transport oxygen to the cells & tissues of the body. Mature erythrocytes are biconcave discs approximately 7.5 microns in diameter. The biconcave shape is an adaptation to increase the surface area over which the exchange of oxygen & carbon dioxide takes place. Erythrocytes are in effect bags of haemoglobin, the blood's oxygen-carrying molecule. They have no cell nucleus. They are also highly flexible & able to squeeze through the smallest capillaries. Magnification: x1120 at 35mm size.

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Keywords: anatomy, cells, erythrocyte, false-coloured, haemoglobin, human body, red blood cell

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