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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.
These tiny air sacs in the lungs are only one cell thick and they are surrounded by capillaries that are also only one cell thick. Blood from the heart flows through these capillaries and collects oxygen from the alveoli.