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How are the lungs kept free of germs and dirt from the air?
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How are the lungs kept free of germs and dirt from the air?

User Raphaeltm
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Mucus found in the bronchial tubes collects dirt and germs that get into your lungs . Tiny hairs called cilia work to sweep out the debris collected to keep your lungs clean.
User Rwehner
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User David Alber
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