title: Two mechanisms for positive inotropism of low-K Ringer solution in bullfrog atrium.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D001001:Anura; D001692:Biological Transport; D002118:Calcium / Q000378:metabolism*; D004553:Electric Conductivity; D006325:Heart Atria; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000187:drug effects; D009200:Myocardial Contraction / Q000187:drug effects; D009206:Myocardium / Q000378:metabolism; D010042:Ouabain / Q000494:pharmacology; D011188:Potassium / Q000494:pharmacology; D011191:Potassium Deficiency; D011892:Rana catesbeiana; D012964:Sodium / Q000378:metabolism; D013997:Time Factors
chemical_list: D010042:Ouabain; D012964:Sodium; D011188:Potassium; D002118:Calcium