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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 passes through the air sacs and enters the blood stream (the circulatory system). The Path of Oxygen The oxygen jumps on to a Red Blood Cell and travels to the capillaries. The Path of Oxygen In the Capillaries, the cells of the body take the oxygen and dump off carbon dioxide.