title: Negative chronotropic response to norepinephrine.
mesh_terms: D000818:Animals; D001285:Atropine / Q000494:pharmacology; D001794:Blood Pressure; D004285:Dogs; D006339:Heart Rate / Q000187:drug effects*; D009638:Norepinephrine / Q000008:administration & dosage / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D011433:Propranolol / Q000494:pharmacology; D012849:Sinoatrial Node / Q000187:drug effects*; D014628:Vagotomy
chemical_list: D001285:Atropine; D011433:Propranolol; D009638:Norepinephrine