Autonomic control of cardiac rhythm.
D000109:Acetylcholine / Q000494:pharmacology*; D001341:Autonomic Nervous System / Q000502:physiology*; D006329:Heart Conduction System; D009638:Norepinephrine / Q000494:pharmacology*; D014630:Vagus Nerve / Q000187:drug effects
D000109:Acetylcholine; D009638:Norepinephrine