Question

How is the entry of dust and bacteria prevented during respiration??
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Answer 1

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Particles, such as dust and soot, mold, fungi, bacteria, and viruses deposit on airway and alveolar surfaces. ... 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.

Answer 2

Answer:

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