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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.
This is where the exchange of oxygen and carbon dioxide takes place. After, oxygen passes into your blood and your blood carries the oxygen to every part of your body. Windpipe (Trachea)- The windpipe, also known as the trachea, takes the air from your mouth and nose into your lungs.