title: Naloxone's antagonism of rigidity but not explosive motor behavior: possible evidence for two types of mechanisms underlying the actions of opiates and opioids.
mesh_terms: D000161:Acoustic Stimulation; D000698:Analgesia; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001562:Benzimidazoles / Q000008:administration & dosage / Q000494:pharmacology*; D006185:Habituation, Psychophysiologic; D007274:Injections, Intraperitoneal; D007276:Injections, Intraventricular; D008297:Male; D009020:Morphine / Q000008:administration & dosage / Q000494:pharmacology*; D009043:Motor Activity / Q000187:drug effects*; D009270:Naloxone / Q000008:administration & dosage / Q000494:pharmacology*; D011187:Posture; D051381:Rats; D011957:Receptors, Opioid / Q000187:drug effects / Q000502:physiology
chemical_list: D001562:Benzimidazoles; D011957:Receptors, Opioid; D009270:Naloxone; D009020:Morphine