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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.
Cells use the oxygen and produce another gas, called carbon dioxide, as a waste product. It is very dangerous if carbon dioxide builds up in your body, so your blood carries the carbon dioxide to your lungs where it is released into the air when you breathe out or exhale.his module will help you understand how gas exchange occurs in the body and why it is so important. After completing this lesson, each student should be able to: 1  Diagram and label the anatomy of the lungs and the circulatory system. 2  Explain how the processes of gas exchange occurs and what purpose it serves.