STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Artery. Coloured scanning electron micrograph (SEM) of a sectioned artery containing red blood cells (erythrocytes, red). Arteries carry oxygenated blood to the body's tissues. They typically have a thick wall (brown) to cope with the high pressure of the blood being pumped around the body by the beating heart. Magnification unknown.
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