At alveoli the exchange of gasses between the bloodstream and air occur.
Oxygen is transferred from the lungs to the bloodstream during gas exchange. Simultaneously, carbon dioxide is transported from the blood to the lungs. This occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries located in the alveolar walls.
The respiratory system's function is to move two gases: oxygen and carbon dioxide. Gas exchange occurs in the lungs' millions of alveoli and the capillaries that surround them.
The moisture layer in the alveoli allows gases to dissolve and diffuse quickly. The dense network of capillaries that surrounds the alveoli provides a very large total surface area and a very good blood supply.
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