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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.
1 Moist-the air sacs are moist with mucus so that gases can dissolve before diffusing. 2  Large surface area-the surface area for gases to diffuse through in human lungs is roughly the same as a tennis court. 3  Good blood supply-the airsacs have a large capillary network so that large volumes of gases can be exchanged. 4  Page.xygen diffuses from the air sac into the blood. Carbon dioxide diffuses from the blood into the air sac. These four features are particularly important to our lungs efficient for gas exchange.