title: Analysis of the effects of changes in rate and rhythm upon electrical activity in the heart.
mesh_terms: D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000502:physiology*; D006325:Heart Atria / Q000294:innervation; D006329:Heart Conduction System / Q000502:physiology*; D006339:Heart Rate; D006352:Heart Ventricles / Q000294:innervation; D008564:Membrane Potentials; D011188:Potassium / Q000502:physiology*; D011690:Purkinje Fibers / Q000502:physiology; D012964:Sodium / Q000502:physiology*
chemical_list: D012964:Sodium; D011188:Potassium; D002118:Calcium