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Air that is breathed in goes past moist tissues and moist hairs. The dust and other foreign particles stick to the moist tissues and moist hairs. Breathing through the mouth filters out fewer foreign particles, so is less good for the lungs.
Tiny hairs in the nose called cilia and mucus trap the dust and other particles and either push them back out the nostril or down into the digestive system.
Mucus and something else

mucous covered membranes and microscopic hairs called cilia sweep dust away, then sneezing and coughing will expel it from the body or it will be swallowed
Weirdly enough, your nostril hairs stop dust from traveling into your lungs.
It dose reach the lungs but a sneeze or a cough brings it right up
By the goblet cells and cilia in your windpipe. Smoking kills these cells, which is when smokers get ill.
ciliated mucous lining in the nose
Goblet and Ciiated cells

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11y ago

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