An alveolus is one of the many dead-end air sacs in the lungs responsible for gas exchange.
An alveolus is one of a multitude of dead-end air sacs in the lungs where the crucial process of gas exchange takes place.
| Front | alveolus |
|---|---|
| Back | One of the dead-end, multilobed air sacs where gas exchange occurs in a mammalian lung. |
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