Harvard Health: There are certain things our bodies do so often and so automatically that we barely notice them. Each is a universal part of our daily human experience, but did you ever wonder why?
Advertisementdistribute a chemical called help prepare our bodies for
Infection. When you have a cold, mucous membranes produce more mucus as part of your defense system: more mucous flowing out means fewer germs getting in. Cold, dry air. The inside surface of the nose is covered with mucous membranes that warm and humidify air well before it reaches the lungs. When you inhale dry, cold air through your nose, these membranes humidify the air by secreting water and mucus.
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