how does our lungs clean themselves from small things that get in them like dust?

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how does our lungs clean themselves from small things that get in them like dust?

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Cilia and mucus. The dust/smoke/particles get trapped in the wet mucosa lining in the lungs. The lining and contaminants are continually pushed out of the lungs via the tiny hairs (cillia) to the throat. Big “blobs” of mucus cause a cough reflex to force the blockage out.

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