SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Blood vessels. Coloured scanning electron micrograph (SEM) of a resin cast of blood vessels from a lung. The lungs are the site of gaseous exchange, where oxygen is taken up by the blood from inhaled air and carbon dioxide released for exhalation. The cast was made by injecting resin into the blood vessels and then chemically digesting the surrounding tissues.
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