Alveoli
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Alveoli
The terminal air sacs deep within the lungs. The inhaled oxygen
diffuses across the thin alveolar membranes (the walls of the
air sacs) into the blood stream, and at the same time carbon dioxide
diffuses from the blood into the alveoli and is exhaled through
the lungs.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use