Air entering the lungs is

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(A) Air entering the lungs is warm and filtered.Nasal Cavity: It is the first part of the respiratory system. It opens to the exterior through nostril

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Warm and filtered

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(A) Air entering the lungs is warm and filtered.Nasal Cavity: It is the first part of the respiratory system. It opens to the exterior through nostrils. The small hairs present in the cavity help to filter the particles of dust and other foreign matter. The air in the nasal cavity gets warmed (because the nasal cavity has a very good blood supply) and moistened before it enters the lungs.

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