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Alveolus

An alveolus is a structure in the lungs that helps us breath. It is shaped much like a balloon, with a hollow inner. The lungs have millions of these alveoli. It is the far end of our breathing apparatus, and the site where oxygen is transported from the air we breathe to our blood system (and later, carbon dioxide released from our blood to the air).

The alveoli of the lungs help us transport oxygen and carbon dioxide between our blood and the air. Photo: Elmirwikipedia, via Wikimedia Commons

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