title: DEVELOPMENT AND LOSS OF TOLERANCE TO MORPHINE IN THE RAT AFTER SINGLE AND MULTIPLE INJECTIONS.
mesh_terms: D004361:Drug Tolerance; D007108:Immune Tolerance; D007267:Injections; D009020:Morphine; D010600:Pharmacology; D005082:Physical Exertion; D010827:Physiology; D051381:Rats; D012106:Research; D013312:Stress, Physiological
chemical_list: D009020:Morphine
keywords: DRUG TOLERANCE; EXERTION; EXPERIMENTAL LAB STUDY; MORPHINE; PHARMACOLOGY; PHYSIOLOGY; RATS; STRESS