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Blood vessels of the small intestine
Blood vessels. Coloured scanning electron micrograph (SEM) of a resin cast of blood vessels in the duodenum, part of the small intestine. A fine network of smaller vessels (capillaries) branch off from main vessels (not seen) and infiltrate the tissue of the duodenum, supplying it with blood. Gases and nutrients are exchanged between the blood and surrounding tissues through the permeable walls of the capillaries. The cast was made by injecting resin into the blood vessels, followed by chemical digestion of the surrounding tissue.
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