title: Small airways and CARA: introduction.
mesh_terms: D001980:Bronchi / Q000503:physiopathology; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D009130:Muscle, Smooth / Q000503:physiopathology; D012123:Pulmonary Ventilation; D012129:Respiratory Function Tests