ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Light micrograph of a section of normal lung tissue showing the smooth muscle & connective tissue walls of alveolar ducts and alveoli (air sacs). The lungs consist of a tree-like network of airways that conduct air from the trachea (windpipe) into the alveoli, where gaseous exchange takes place. Magnification: x60 at 35mm size.
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