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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 heart and lungs work together to deliver oxygen to and remove carbon dioxide from the body's tissues. When you inhale, oxygen enters the blood via little sacs in the lungs called alveoli. The oxygenated blood travels through the pulmonary veins to the left side of the heart, where it is pumped throughout the body.