POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes, red) and a single white blood cell (leucocyte, centre). Red blood cells are carriers of oxygen and carbon dioxide. Their biconcave surface provides maximum surface area for the exchange of gases. There are a number of different types of white blood cell, all of which are part of the immune system. Magnification: x4400 when printed 10 centimetres wide.
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