SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Liver blood vessels. Coloured scanning electron micrograph (SEM) of a resin cast of blood vessels in the liver. 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 liver has a number of functions, including detoxifying the blood, glycogen storage and bile production. The cast was made by injecting resin into the blood vessels and then chemically digesting the surrounding tissues.
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