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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.
As you inhale, oxygen in the air travels through your lungs into tiny air sacs called alveoli. The alveoli in your lungs are covered with tiny blood vessels called capillaries. The oxygen you breathe in is transferred to your blood through the capillaries.