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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.
So, we can see that oxygen and carbon-di-oxide, this 2 major gas exchanged from alveolus to blood and from blood to alveolus respectively by diffusion in the lung. This exchange happening maximum in base of the lung and minimum in apex of the lung.he human gas exchange process happens in the lungs and this process is accomplished by the mechanisms of the heart. The process of movement of the air in and out of the lungs is called ventilation.