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Tiny air sacs where the exchange of gases between air blood takes place. Tiny air sacs found inside the lungs through which oxygen enters and carbon dioxide leaves through the bloodstream during breathing; found on the tips of the bronchioles. Bronchi The trachea divides into these right and left branches providing a passageway for air.
How does oxygen diffuse into the blood and how does carbon dioxide leave the blood? I mean, the blood doesn't leak into the lungs to pick up the oxygen and the blood doesn't just throw out the carbon dioxide. Thanks. =]. Add your answer. Source.