AMI IMAGES / SCIENCE PHOTO LIBRARY AMI IMAGES / SCIENCE PHOTO LIBRARY
Blood cells. Coloured scanning electron micrograph (SEM) of a red blood cell (erythrocyte, red) and a monocyte white blood cell (lymphocyte, white). Erythrocytes are carriers of oxygen and carbon dioxide. Their biconcave surface provides maximum surface area for the exchange of gases. Monocytes, like all white blood cells, are part of the human body's immune system.
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