What is the name of the small air sacs in the lungs where oxygen is exchanged for carbon dioxide?

Gas exchange takes place in the alveoli, tiny air sacs at the ends of the smallest airways. Oxygen moves from the air in the alveoli into the blood, while carbon dioxide moves from the blood into the alveoli to be exhaled. The diaphragm helps with breathing, capillaries carry blood, and bronchioles conduct air to the alveoli.

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