The epithelial lining of the inner wall of trachea bears cilia. What may be the purpose of this?

Cilia help in pushing the air downwards

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Cilia help in cleaning the air

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Cilia beat upwards to push mucus out

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Cilia are non-functional in the trachea

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Solution

The correct option is B
Cilia help in cleaning the air

Cilia inside the trachea help in the removal of any dust particle of microbial contamination that gets trapped in the mucus coating secreted by the epithelial cells. It pushes the mucus outside, which is then coughed out by the individual as phlegm.

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