What is the purpose of the cilia?
a. Warm and moisturize inhaled air
b. Sweep debris toward nasal cavity
c. Stimulate cough reflex
d. Produce mucus
ANS: B
The cilia are fine hairlike processes on the outer surfaces of small cells that produce a motion that sweeps the debris toward the nasal cavity. Large particles that are swept away stimulate the cough reflex, but not the cilia themselves.
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