title: On looking at electrical activity of heart muscle.
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology*; D000200:Action Potentials; D000818:Animals; D002301:Cardiac Glycosides / Q000494:pharmacology; D002415:Cats; D002463:Cell Membrane Permeability; D004594:Electrophysiology; D004837:Epinephrine / Q000494:pharmacology; D006168:Guinea Pigs; D006321:Heart / Q000187:drug effects* / Q000502:physiology*; D006329:Heart Conduction System / Q000187:drug effects; D006339:Heart Rate; D008564:Membrane Potentials / Q000187:drug effects; D009119:Muscle Contraction / Q000187:drug effects*; D009206:Myocardium / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D011802:Quinidine / Q000494:pharmacology; D011817:Rabbits; D012964:Sodium / Q000378:metabolism
chemical_list: D002301:Cardiac Glycosides; D012964:Sodium; D011802:Quinidine; D000109:Acetylcholine; D011188:Potassium; D004837:Epinephrine