FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Lung alveolus blood supply, artwork. The alveoli (air sacs) are the site of gaseous exchange in the lungs. Carbon dioxide from de-oxygenated red blood cells (blue) passes from the capillaries, across the alveolar epithelium, into the alveoli, and is exhaled from the lungs. Inhaled oxygen dissolves on the mucosal lining of the epithelium and passes into the capillaries where it is taken up by the red blood cells. This oxygenated blood( red) is then carried around the body.
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