title: Letter: Positive inotropic action of acetylcholine on frog heart.
mesh_terms: D000109:Acetylcholine / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D000818:Animals; D004837:Epinephrine / Q000037:antagonists & inhibitors / Q000494:pharmacology; D006321:Heart / Q000187:drug effects*; D008012:Lidocaine / Q000494:pharmacology; D010643:Phenoxybenzamine / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology; D011898:Ranidae
chemical_list: D010643:Phenoxybenzamine; D008012:Lidocaine; D011433:Propranolol; D000109:Acetylcholine; D004837:Epinephrine