Disease of the small airways in chronic bronchitis.
D000402:Airway Obstruction / Q000209:etiology; D000403:Airway Resistance; D001344:Autopsy; D001980:Bronchi / Q000033:anatomy & histology / Q000473:pathology*; D001991:Bronchitis / Q000150:complications / Q000473:pathology*; D002908:Chronic Disease; D006801:Humans; D008722:Methods; D009093:Mucus; D011656:Pulmonary Emphysema / Q000150:complications / Q000473:pathology*