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What Happens Between the Alveoli and Capillaries
Oxygen enters the alveoli and dissolves into the moist film lining their inner surfaces and rapidly diffuse across the epithelium into a web of capillaries that surrounds each alveolus.
Carbon Dioxide diffuses in the opposite direction, from the capillaries across the epithelium of the alveolus into the airspace.
Gas exchange occures in the alveoli, which are air sacs clustered at the tips of the tiniest bronchioles.
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