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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.
Blood capillaries allow for the rapid exchange of carbon dioxide and oxygen to occur. Carbon dioxide diffuses from the erythrocytes (red blood cells), through the capillary wa â¦ lls, into the alveoli, and is exhaled through the mouth and nose.9 people found this useful.arbon dioxide is released from the blood through the capillary w â¦ alls and into the alveoli, while oxygen is picked up from the alveoli through the capillary walls and into the blood.