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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 Respiration includes gas exchange in the lungs, circulation of gases through the blood stream, and transfer of gases at the cellular level. 2  Air is drawn into the air sacs of the lungs, where oxygen from the air can enter the blood. 3  Carbon dioxide exits from the blood into the alveolar air. In other words, oxygen diffuses towards the blood and is taken up by hemoglobin, and carbon dioxide diffuses towards the alveolus and mixes with the air. 2  No âactive processâ is involved. 3  Oxygen simply diffuses through the membrane and plasma, and is taken up by the red blood cells.