Inhibition by morphine of the release of acetylcholine from the intestine of the guinea-pig.
D000109:Acetylcholine / Q000502:physiology*; D006168:Guinea Pigs; D007421:Intestine, Small; D007422:Intestines / Q000502:physiology*; D009020:Morphine / Q000494:pharmacology*
D009020:Morphine; D000109:Acetylcholine
ACETYLCHOLINE/physiology; INTESTINES/physiology; MORPHINE/effects