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Question

The function of tracheal cilia is to


A
Pass mucus out
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B
Pass mucus in
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C
Pass air out
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D
Pass air in
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Solution

The correct option is D Pass mucus out
Cilia in the trachea trap particles like bacteria and viruses. The cilia move the inhaled particle along with mucus up to the pharynx where it is either coughed out or swallowed into gastrointestinal tract.
So, the correct answer is option A.

Biology

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