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In the alveoli Alveolus (also called air sac) is the capillary-rich sac in the lungs where the exchange of oxygen and carbon dioxide takes place by diffusion.
alveoli tiny air sacs at the end of the bronchioles tiny branches of air tubes in the lungs the alveoli are where the lungs and the bloodstream exchange carbon dioxide and oxygen carbon dioxide in the blood passes into the lungs through the alveolioxygen in the lungs passes through the alveoli into the bloodnih national cancer institutehe alveoli are where the lungs and the bloodstream exchange carbon dioxide and oxygen carbon dioxide in the blood passes into the lungs through the alveoli oxygen in the lungs passes through the alveoli into the blood nih national cancer institute