Multiple Choice
The mucous membranes of the respiratory tract repel pathogens because they
A) contain cilia, which propel pathogens out of the body.
B) produce mucus, which traps pathogens.
C) contain an acid mantle, which inhibits bacterial growth.
D) consists of tough protein, which repels most pathogens.
Correct Answer:
Verified
Correct Answer:
Verified
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