title: The dependence of twitch relaxation on sodium ions and on internal Ca2+ stores in voltage clamped frog atrial fibres.
mesh_terms: D000628:Aminophylline / Q000494:pharmacology; D000818:Animals; D001001:Anura; D016275:Atrial Function; D003994:Bucladesine / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism*; D004837:Epinephrine / Q000494:pharmacology; D066298:In Vitro Techniques; D009200:Myocardial Contraction / Q000187:drug effects; D011893:Rana esculenta; D012964:Sodium / Q000378:metabolism*; D013268:Stimulation, Chemical
chemical_list: D000628:Aminophylline; D003994:Bucladesine; D012964:Sodium; D002118:Calcium; D004837:Epinephrine