STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Red blood cells. Coloured scanning electron micrograph of red blood cells in tissue. Blood is composed mainly of red blood cells (erythrocytes). Red blood cells are pumped to all parts of the body. They contain haemoglobin which bonds with oxygen in a reversible reaction in the lungs, and then releases that oxygen to cells in tissues. They then remove carbon dioxide from the cells and return it to the lungs. Tissues are collections of similar cells acting together to perform specific functions in the body (eg. Magnification: x1100 when printed 10 cm wide.
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