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Lungs - Bronchial Mucus Causing Airway Obstruction. Shown Is Bronchial Airway Obstruction And Narrowing Due To Viscid Mucus. Excessive Mucus In Bronchial Airways Can Cause Significant Obstruction And And Interferes With Pulmonary Function. This Is Particularly Problematic For Those With Asthma And Chronic Bronchitis.