title: alpha and beta-adrenoceptors in chicken airways.
abstract: Isolated chicken bronchus (which had been partially contracted to carbachol) relaxes to isoproterenol and epinephrine but contracts weakly to phenylephrine. Propranolol (a beta-adrenoceptor blocker) antagonizes isoproterenol and reverses epinephrine-induced relaxations to feeble contractions. Phenylephrine-induced bronchoconstrictions and constrictions to epinephrine (in the presence of beta-blockade) were blocked by phentolamine. The results of this study showed the predominance of beta-)inhibitory) adrenoceptors and some alpha-(excitatory) adrenoceptors in the bronchus of the adult domestic fowl.
mesh_terms: D000707:Anaphylaxis / Q000503:physiopathology; D000818:Animals; D001980:Bronchi / Q000187:drug effects*; D002217:Carbachol / Q000494:pharmacology; D002645:Chickens; D004837:Epinephrine / Q000494:pharmacology; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology; D010656:Phenylephrine / Q000494:pharmacology; D011941:Receptors, Adrenergic / Q000187:drug effects*; D011942:Receptors, Adrenergic, alpha / Q000187:drug effects*; D011943:Receptors, Adrenergic, beta / Q000187:drug effects*
chemical_list: D011941:Receptors, Adrenergic; D011942:Receptors, Adrenergic, alpha; D011943:Receptors, Adrenergic, beta; D010656:Phenylephrine; D002217:Carbachol; D007545:Isoproterenol; D004837:Epinephrine