Blood vessels. Coloured scanning electron micrograph (SEM) of a resin cast of blood vessels that supply the small intestine. This branching network of fine vessels infiltrates the tissue of the duodenum, the first part of the small intestine, supplying it with blood. Gases and nutrients are exchanged between the blood and surrounding tissue through the permeable walls of capillaries, the smallest blood vessels. The cast was made by injecting resin into the blood vessels. The surrounding tissues were then chemically digested. Magnification: x32 at 6x7cm size.
October 7th, 2018
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