title: Opioid physiology.
mesh_terms: D000758:Anesthesia; D000818:Animals; D004558:Electric Stimulation; D004723:Endorphins / Q000502:physiology*; D006801:Humans; D009270:Naloxone / Q000494:pharmacology; D009434:Neural Pathways / Q000502:physiology; D009474:Neurons / Q000187:drug effects; D009475:Neurons, Afferent / Q000187:drug effects; D009619:Nociceptors / Q000502:physiology*; D013116:Spinal Cord / Q000502:physiology; D009435:Synaptic Transmission
chemical_list: D004723:Endorphins; D009270:Naloxone