STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Blood vessel. Coloured scanning electron micrograph (SEM) of a longitudinal section through a blood vessel showing its red blood cells (red). Both healthy (disc-like) and crenated (star-like) forms of the red blood cells (erythrocytes) are visible against the vessel's endothelium (brown). Crenated blood cells may be symptomatic of a blood disorder, but are more likely to be due to prolonged storage of blood. Red blood cells supply the tissues with oxygen. Magnification unknown.
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