The function of the "ciliary escalator" is to
A) propel inhaled dust and microorganisms toward the throat.
B) remove microorganisms from the gastrointestinal tract.
C) remove microorganisms from the lower respiratory tract.
D) remove microorganisms from the upper respiratory tract.
E) trap inhaled dust and microorganisms in mucous and propel it away from the lower respiratory tract.
Answer: E) trap inhaled dust and microorganisms in mucous and propel it away from the lower respiratory tract.
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