what is the role of mucus and cilia in keeping the air passages free from dust particles and pathogens
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Cilia propel a liquid layer of mucus that covers the airways. The mucus layer traps pathogens (potentially infectious microorganisms) and other particles, preventing them from reaching the lungs.
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Explanation:cilia "beat" mucus and bacteria upward from the lungs to the oral and nasal cavity to be expelled from the body.
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