title: Influence of vagal activity on classically conditioned heart rate in rats.
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001285:Atropine / Q000494:pharmacology; D003214:Conditioning, Classical; D004597:Electroshock; D005108:Extinction, Psychological; D005260:Female; D006321:Heart / Q000294:innervation; D006339:Heart Rate / Q000187:drug effects; D051381:Rats; D013564:Sympathetic Nervous System / Q000502:physiology; D014630:Vagus Nerve / Q000502:physiology*
chemical_list: D001285:Atropine