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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.
The gaseous exchange of oxygen (O2) and carbon dioxide (CO2) occurs within the lungs. Oxygen is inhaled through the mouth and nose, it passes through the bronchi, which branch â¦ off into smaller airways called bronchioles.It is at the ends of these bronchioles where the Alveoli are, (tiny, pear shaped sacks).he gaseous exchange of oxygen (O2) and carbon dioxide (CO2) occurs within the lungs. Oxygen is inhaled through the mouth and nose, it passes through the bronchi, which branch â¦ off into smaller airways called bronchioles.