The Airway · Lungs
Air is warmed, moistened and filtered before it goes deeper.
Your nose isn't just an entrance — it's air conditioning. In the fraction of a second air spends inside it, it gets warmed close to body temperature, moistened, and stripped of dust by a lining of mucus and fine hairs.
That matters because the delicate tissue further down works best with warm, damp, clean air. Breathing through your mouth skips most of the conditioning, which is why mouth-breathing cold dry air leaves your throat raw.
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