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During normal respiration, air travels through the nose, down the trachea, and into smaller and smaller airways called bronchi. The lining of the respiratory tract is covered with mucus membranes which secrete a sticky fluid called mucus. Mucus cleans and protects the air passages by trapping bacteria and debris; mucus also keeps the air passages moist and lubricated.
People who have chronic respiratory ailments such as COPD or asthma can have an increased build up of ... more
