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 blood cells (red). Both healthy (disc-like) and crenated (star-like) forms of red blood cells (erythrocytes) are visible against the vessel's endothelium (green). Red blood cells supply the tissues with oxygen. Magnification: unknown.
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