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  • Mucous

    Mucous is a slippery secretion produced by, and covering, mucous membranes. In the respiratory system mucus aids in the protection of the lungs by trapping foreign particles that enter, particularly through the nose, during normal breathing. "Phlegm" is a specialized term for mucus that is restricted to the respiratory tract, while the term "mucus" more globally describes secretions of the nasal passages as well.

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