Blood vessels. Coloured scanning electron micrograph (SEM) of a resin cast of blood vessels in a lymph node. This network of vessels infiltrates the tissue, 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 and then chemically digesting the surrounding tissues.
June 29th, 2016
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