Alveoli are an important part of the respiratory system whose function it is to exchange oxygen and carbon dioxide molecules to and from the bloodstream. These tiny, balloon-shaped air sacs sit at the very end of the respiratory tree and are arranged in clusters throughout the lungs. Alveoli are tiny balloon shaped structures and are the smallest passageway in the respiratory system. The alveoli are very thin, allowing the relatively easy passage of oxygen and carbon dioxide CO2 between the alveoli and blood vessels called capillaries. One cubic millimeter of lung tissue contains around alveoli. While the total number can vary from one person to the next, there are literally millions within the human lungs spanning a surface area of roughly 70 square meters.
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