Question

Why hair like projection are present on the outer surfaces of epithelial cells in respiratory tract ?

Answer 1

Tiny hair like projections are present on the outer surface of respiratory tracts and other epithelial cells because they epithelial cells are very critical and cannot withstand outside dust and germs.Thus, the cilia or the hairy projections prevent the dust particles from entering our body and they also drive the O2 molecules inside the body.Hope this helps

Answer 2

Answer:

cilia

Explanation:

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