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, capillaries (blood vessels), and type II pneumocyte cells (yellow). 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. Type II cells are responsible for the production and secretion of surfactant, a type of phospholipid that reduces the alveolar surface tension, facilitating gas exchange. Magnification: x2670 when printed 10 centimetres wide.
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