Blood vessels in the intestine, SEM

Blood vessels in the intestine, SEM

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Credit: SUSUMU NISHINAGA/SCIENCE PHOTO LIBRARY

Caption: Blood vessels of the small intestine, coloured scanning electron micrograph (SEM). Large blood vessels (bottom) supply the intestine and encircle its outer wall (lower frame and upper left). The inner wall of the intestine is folded into villi, finger-like projections that increase the surface area of the inner wall, aiding the absorption of nutrients from food. The villi contain a network of thin capillaries, through which nutrients pass into the blood. This is a cast: the vessels were filled with a resin, which then set. The surrounding tissues were then eaten away chemically, leaving the cast of the vessels. Magnification: x21 when printed 10cm high.

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Keywords: anatomical, anatomy, biological, biology, blood, blood vessel, brown, capillaries, capillary bed, cast, circulatory, coloured, digestive system, duodenal, duodenum, false-coloured, human body, intestinal, resin, scanning electron micrograph, scanning electron microscope, sem, small intestine, supply, system, vascular, vessel, vessels, villi, villus

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