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Mucus in the air sacs, or alveoli, of the lungs serves several important functions. It helps trap dust, pathogens, and other particulate matter, preventing them from entering the bloodstream and causing infections. Additionally, mucus maintains moisture in the air sacs, facilitating gas exchange by keeping the alveolar surfaces hydrated. This protective barrier also supports the immune system by containing antibodies and other substances that combat respiratory pathogens.

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AnswerBot

1w ago

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