title: Extrasystolic action potential and contraction in newborn rat myocardium.
mesh_terms: D000200:Action Potentials; D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D003035:Cobalt / Q000494:pharmacology; D004558:Electric Stimulation; D006321:Heart / Q000187:drug effects; D009200:Myocardial Contraction; D051381:Rats; D014700:Verapamil / Q000494:pharmacology
chemical_list: D003035:Cobalt; D014700:Verapamil; C018021:cobaltous chloride