GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Normal alveoli. Computer illustration of healthy alveoli (round) on bronchioles (long, branch-like) and their blood supply (red and blue). Alveoli are the tiny air sacs of the lungs where gases are exchanged between the air in the lungs and the blood. They are found at the ends of the bronchioles, tiny airways leading from the bronchi. Here, an inset shows how oxygen (red) from inhaled air passes into the blood system from inside the alveoli, and waste gases (blue) pass from the blood supply into the alveoli in order to be expelled when breathing out.
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