how does our lungs clean themselves from small things that get in them like dust?
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The cells coating the inside of your lungs (epithelial cells) have little hair-like structures called cilia which can vibrate and move a layer of fluid (mucus) produced by other cells known as goblet cells. Any irritant or pathogen can get stuck in this mucus as it is moved up to a position where it can be coughed out.
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