BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Light micrograph of healthy human lung tissue showing alveoli. 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: x180 when printed at 10 centimetres tall.
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