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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.
What are the structures in the lungs where gas exchange takes place? The alveolus (plural = alveoli) is the tiny air sac in the lung  where gas exchange occurs. Oxygen from the inhaled air diffuses  through the walls of the alveoli and adjaceâ¦nt capillaries into the  red blood cells.