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The exchange of oxygen for carbon dioxide in the lungs occurs across the air sacs called
alveoli that have walls rich in capillaries. These sacs provide surfaces where gases can
diffuse back and forth between the bloodstream and the air space. Specifically, oxygen in
newly inhaled air within the alveolar air space will diffuse into the bloodstream; while
carbon dioxide, rich in the blood coming into the lungs, will diffuse from the bloodstream
into the air space to be exhaled from the body.
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