title: The physiological implications of airways smooth muscle constriction.
mesh_terms: D001980:Bronchi / Q000502:physiology*; D006801:Humans; D007545:Isoproterenol / Q000494:pharmacology; D008176:Lung Volume Measurements; D008688:Methacholine Compounds / Q000494:pharmacology; D009119:Muscle Contraction / Q000187:drug effects; D009129:Muscle Tonus / Q000187:drug effects; D009130:Muscle, Smooth / Q000502:physiology
chemical_list: D008688:Methacholine Compounds; D007545:Isoproterenol