title: The laryngeal-closure reflex and nitrous oxide-oxygen analgesia.
mesh_terms: D000328:Adult; D000698:Analgesia; D000766:Anesthesia, Dental; D005683:Gagging / Q000187:drug effects*; D006801:Humans; D007830:Larynx / Q000502:physiology*; D009609:Nitrous Oxide; D010100:Oxygen; D011440:Propyliodone; D012018:Reflex / Q000187:drug effects*
chemical_list: D011440:Propyliodone; D009609:Nitrous Oxide; D010100:Oxygen