JEANETTE ENGQVIST / SCIENCE PHOTO LIBRARY JEANETTE ENGQVIST / SCIENCE PHOTO LIBRARY
Alveoli in the lung. Computer illustration of alveoli (spheres) and a bronchiole (tube) from a lung. The alveoli are the tiny air sacs of the lungs where gases are exchanged (inset, upper left) between the air in the lungs and the blood. Bronchioles are small airways that carry inhaled air to the alveoli and used air from them.
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