EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Lung tissue. Coloured scanning electron micrograph (SEM) of a section through a lung, showing alveoli (hollows), alveolar ducts, and capillaries (blood vessels). Alveoli are tiny airsacs that are the site of gas exchange in the lungs, where oxygen from inhaled air is taken up by the blood and carbon dioxide is released to be exhaled. Magnification: x120 when printed 10 centimetres wide.
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