title: Role of norepinephrine release in the interval-strength relationship of heart muscle.
mesh_terms: D000818:Animals; D002415:Cats; D004558:Electric Stimulation; D004983:Ethanolamines / Q000494:pharmacology; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000502:physiology*; D009206:Myocardium / Q000378:metabolism*; D009638:Norepinephrine / Q000378:metabolism*; D010210:Papillary Muscles / Q000378:metabolism*; D012110:Reserpine / Q000494:pharmacology; D013565:Sympatholytics / Q000494:pharmacology; D014439:Tyramine / Q000494:pharmacology
chemical_list: D004983:Ethanolamines; D013565:Sympatholytics; D012110:Reserpine; D009638:Norepinephrine; D014439:Tyramine