title: Electrical responses of cardiac muscle in a Na-free high-Ca solution.
mesh_terms: D000200:Action Potentials / Q000187:drug effects*; D000818:Animals; D001001:Anura; D002118:Calcium / Q000494:pharmacology*; D004837:Epinephrine / Q000494:pharmacology; D006321:Heart / Q000187:drug effects*; D066298:In Vitro Techniques; D011894:Rana pipiens; D013779:Tetrodotoxin / Q000494:pharmacology
chemical_list: D013779:Tetrodotoxin; D002118:Calcium; D004837:Epinephrine