Positive chronotropic effect of vagus on sinus node.
D000818:Animals; D001949:Bretylium Compounds / Q000494:pharmacology; D002415:Cats; D002572:Cervical Plexus / Q000502:physiology; D004285:Dogs; D004558:Electric Stimulation; D006329:Heart Conduction System / Q000502:physiology*; D006892:Hydroxydopamines / Q000494:pharmacology; D009411:Nerve Endings / Q000187:drug effects; D013564:Sympathetic Nervous System / Q000502:physiology; D013610:Tachycardia / Q000209:etiology*; D013757:Tetraethylammonium Compounds / Q000494:pharmacology; D014630:Vagus Nerve / Q000502:physiology*
D001949:Bretylium Compounds; D006892:Hydroxydopamines; D013757:Tetraethylammonium Compounds