The antagonistic effects of sodium and calcium on the action potential of guinea pig papillary muscle.
D000818:Animals; D001783:Blood Flow Velocity; D002118:Calcium / Q000494:pharmacology*; D006168:Guinea Pigs; D006334:Heart Function Tests; D006352:Heart Ventricles; D006801:Humans; D010210:Papillary Muscles / Q000187:drug effects*; D012964:Sodium / Q000494:pharmacology*
D012964:Sodium; D002118:Calcium