title: The effects of analgesic drugs upon excised frog and terrapin hearts and upon the terrapin cardiac vagus nerve.
mesh_terms: D000700:Analgesics; D006321:Heart / Q000187:drug effects*; D006801:Humans; D014630:Vagus Nerve
chemical_list: D000700:Analgesics
keywords: HEART/effects of drugs on; NERVES/vagus