title: The electrogram from sinus venosus of toad recorded in vitro and the effect of high concentration of potassium and calcium on it.
mesh_terms: D000818:Animals; D002025:Bufonidae; D002118:Calcium / Q000494:pharmacology*; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D066298:In Vitro Techniques; D011188:Potassium / Q000494:pharmacology*
chemical_list: D011188:Potassium; D002118:Calcium