Hyperplasia of bronchial muscle in chronic bronchitis.
D001980:Bronchi / Q000473:pathology* / Q000503:physiopathology; D001991:Bronchitis / Q000473:pathology* / Q000503:physiopathology; D002467:Cell Nucleus; D002908:Chronic Disease; D004417:Dyspnea / Q000209:etiology; D006801:Humans; D006965:Hyperplasia; D009130:Muscle, Smooth / Q000473:pathology