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alveoli (al-VEE-oh-ly)

 Tiny air sacs at the end of the bronchioles in the lungs.

Enlarge
Respiratory anatomy; drawing shows right lung with upper, middle, and lower lobes; left lung with upper and lower lobes; and the trachea, bronchi, lymph nodes, and diaphragm. Inset shows bronchioles, alveoli, artery, and vein.




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