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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.
Answer by Hanbert. Confidence votes 6.2K. The lungs are the site of gas exchange, meaning that oxygen will enter your blood and carbon dioxide will leave your blood in the lungs. Oxygen is needed to generate energy in cells and carbon dioxide is a waste product that can acidify the blood if not expelled.he lungs are the most important organ in your body. Without our lungs, we wouldn't be alive. Our lungs helps us inhale oxygen and exhale carbon dioxide. The lungs are also th â¦ e biggest organ in our body. So the lungs are important.