Air breathed in through your nose is warmed to a comfortable temperature for your lungs, and moistened and cleaned more effectively than air breathed in through your mouth. Small hairs in the nose filter out dirt. Mucus inside the nose traps some of the dirt, and tiny hairs called cilia push this to the throat where it is swallowed. Like the nose, the air passages in the lungs have mucus and cilia to help clean the air breathed in.
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Vimal shah
Air breathed in through your nose is warmed to a comfortable temperature for your lungs, and moistened and cleaned more effectively than air breathed in through your mouth. Small hairs in the nose filter out dirt. Mucus inside the nose traps some of the dirt, and tiny hairs called cilia push this to the throat where it is swallowed. Like the nose, the air passages in the lungs have mucus and cilia to help clean the air breathed in.