Definition of "alveoli" []

• Plural form of alveolus. (noun)

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• "Within alveoli, oxygen from inhaled air is absorbed into the bloodstream in exchange for carbon dioxide waste that is exhaled."
• "At the end of each bronchiole are tiny sacs called alveoli, each one of them lined with a thin layer of fluid that keeps each alveolus open."
• "The lungs contain tiny air sacs known as alveoli and bronchioles, the narrow passages leading to the air sacs which become permanently distended with air under this condition."