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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.
Background. When we breathe, air enters our lungs and fills tiny airsacs called alveoli. Each air sac is surrounded by an extensive capillary bed, which is a network of tiny, thin blood vessels. In order for us to bring in oxygen and release carbon dioxide, the alveoli and capillaries must be properly aligned.ach air sac is surrounded by an extensive capillary bed, which is a network of tiny, thin blood vessels. In order for us to bring in oxygen and release carbon dioxide, the alveoli and capillaries must be properly aligned.