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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 alveoli are the areas within the lungs where the oxygen is transferred into the blood in exchange for carbon dioxide. In other words, this is where the gas exchange takes place. The air travels through the alveolar ducts into the alveolar sac where it is met with capillary networks.