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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 oxygen enters the bloodstream in the smallest part of the lungs called the alveoli. The alveoli are tiny structures on the lungs covered in capillaries, and this is where the gas exchange occurs. Oxygen enters the bloodstream through the lungs.