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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.
In the air sacs, oxygen that we breathe passes through the walls of air sacs into the bloodstream . Carbon dioxide passes in the reverse direction, out of the bloodstream, back into the alveoli, and is then eliminated by breathing out . Carbon dioxide is a waste product of the body's metabolism, and must be regularly removed.