title: Essential hypertension: are catecholamines involved? Introduction.
mesh_terms: D000818:Animals; D001794:Blood Pressure; D002395:Catecholamines / Q000502:physiology*; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D009638:Norepinephrine / Q000097:blood; D013564:Sympathetic Nervous System / Q000503:physiopathology
chemical_list: D002395:Catecholamines; D009638:Norepinephrine