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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.
Alveoli Alveoli are at the end of the airways. Oxygen can quickly move from the air sacs into the blood, and carbon dioxide moves from the blood into the air sacs. Blood that carries oxygen then flows back to the heart and is pumped to the body.