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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.
The bronchioles end in tiny air sacs called alveoli. Carbon dioxide is exchanged for oxygen through the thin walls of these sacs. Oxygen can readily enter the blood to be pumped through the body by the heart, and carbon dioxide can escape from the blood back into the lungs to be exhaled.