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Alveoli
alveoli - air sacs in your lungs
Alveolar means pertaining the the alveolus (plural alveoli), the small air sacs in the lungs.
I Think You Thinking Of The Alveoli/Alveoli's
small air sacs in your lungs are alveoli (plural) they are where the air you breath in is stored
air sacs in the lungs