title: Interaction between the parasympathetic and sympathetic divisions of the autonomic nervous system in cardiac rhythm regulation.
mesh_terms: D000328:Adult; D001285:Atropine / Q000494:pharmacology; D014644:Genetic Variation; D006339:Heart Rate; D006801:Humans; D008297:Male; D008955:Models, Cardiovascular; D010275:Parasympathetic Nervous System / Q000502:physiology*; D011433:Propranolol / Q000494:pharmacology; D012894:Sleep Stages / Q000502:physiology; D013564:Sympathetic Nervous System / Q000502:physiology*
chemical_list: D001285:Atropine; D011433:Propranolol