title: The action of caffeine on frog myocardial contractility.
mesh_terms: D000818:Animals; D001001:Anura; D002110:Caffeine / Q000494:pharmacology*; D006321:Heart / Q000187:drug effects* / Q000502:physiology; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects*; D011188:Potassium; D012964:Sodium; D013997:Time Factors
chemical_list: D002110:Caffeine; D012964:Sodium; D011188:Potassium