Which of the following acts as a first line of defence against foreign pathogens for the respiratory system?

Mucus in lungs

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White Blood Cells

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Tiny hair follicles of nostrils

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HCL

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Solution

The correct option is C Tiny hair follicles of nostrils
Tiny hair follicles that cover the interior lining of nostrils act as the body’s first line of defence against foreign pathogens.

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