PHOTO INSOLITE REALITE / SCIENCE PHOTO LIBRARY PHOTO INSOLITE REALITE / SCIENCE PHOTO LIBRARY
False-colour scanning electron micrograph (SEM) of red blood cells (erythrocytes) densely packed into a capillary, the smallest type of blood vessel. Capillaries are made up exclusively of endothelial cells. Erythrocytes are essentially non-motile bags of haemoglobin; their biconcave shape is an adaptation for maximum surface area over which the exchange of oxygen & carbon dioxide can occur. They are flexible, & can accommodate themselves to the smallest capillaries. Magnification: x600 at 35mm size.
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