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 numerous alveoli (hollows) and alveolar ducts. 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: x130 when printed 10 centimetres wide.
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