title: Some aspects of excitation-contraction coupling in frog heart.
mesh_terms: D000818:Animals; D001001:Anura; D002118:Calcium / Q000032:analysis / Q000494:pharmacology; D006321:Heart / Q000187:drug effects / Q000502:physiology*; D066298:In Vitro Techniques; D009119:Muscle Contraction; D011188:Potassium / Q000494:pharmacology; D012519:Sarcoplasmic Reticulum / Q000032:analysis; D012964:Sodium / Q000494:pharmacology
chemical_list: D012964:Sodium; D011188:Potassium; D002118:Calcium