Sympathetic-vagal interactions in the sinus and atrioventricular nodes.
D000818:Animals; D001283:Atrioventricular Node / Q000502:physiology*; D002304:Cardiac Pacing, Artificial; D004285:Dogs; D004562:Electrocardiography; D006329:Heart Conduction System / Q000502:physiology*; D006339:Heart Rate; D012849:Sinoatrial Node / Q000502:physiology*; D013564:Sympathetic Nervous System / Q000502:physiology*; D014630:Vagus Nerve / Q000502:physiology*