Answer :
Final answer:
The delicate respiratory exchange surfaces that protect from pathogens, debris, and other hazards are the mucous membranes and the mucociliary escalator in the respiratory system. In the nasal cavity, the respiratory system has hairs and mucus that trap small particles, viruses, bacteria, dust, and dirt to prevent their entry.
Explanation:
The delicate respiratory exchange surfaces that protect from pathogens, debris, and other hazards are the mucous membranes and the mucociliary escalator in the respiratory system.
In the nasal cavity, the respiratory system has hairs and mucus that trap small particles, viruses, bacteria, dust, and dirt to prevent their entry. The goblet cells in the respiratory epithelium secrete a layer of sticky mucus that inhibits microbial attachment. The ciliated epithelial cells help move the mucus and trapped microbes upward toward the throat, where they can be swallowed.
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