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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.
Gas Exchange. Gas exchange refers to the passing of Oxygen from the alveoli into the blood flow and the excess Carbon Dioxide (CO2) within the blood flow passing back into the alveoli to be breathed out. Each tiny alveoli is covered in a network of capillaries (tiny blood vessels) which make this process easier.