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Alveolus
Synonyms Air sac
Forms Adj.: alveolar.
Plural: alveoli
Etymology

Derived from the Latin term, "alveus" (tray or basin)

Free definitions
Wiktionary
1. A small cavity or pit.

2. (anatomy) an anatomical structure that has the form of a hollow cavity

3. (anatomy) a small air sac in the lungs, where oxygen and carbon dioxide are exchanged with the blood.
Wikipedia
An alveolus (plural: alveoli, from Latin alveolus, "little cavity") is an anatomical structure that has the form of a hollow cavity.
MeSH ID

D011650

Alveoli are the air sacs of the lungs where gas exchange occurs via specialized capillaries.

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