Dependence of the contractility of coronary muscle on substances favouring contraction and relaxation.
D000818:Animals; D001775:Blood Circulation / Q000187:drug effects; D002417:Cattle; D003331:Coronary Vessels / Q000187:drug effects*; D004558:Electric Stimulation; D004837:Epinephrine / Q000494:pharmacology; D006736:Horses; D009119:Muscle Contraction / Q000187:drug effects*; D014662:Vasoconstrictor Agents / Q000494:pharmacology*; D014665:Vasodilator Agents / Q000494:pharmacology*
D014662:Vasoconstrictor Agents; D014665:Vasodilator Agents; D004837:Epinephrine