Question: Identify the characteristics that best describe motilin, neuropeptide Y, or substance P. Motilin Neuropeptide Y Substance P Characteristics Released by enteroendocrine cells and not neuronsSuppresses gastric and pancreatic secretionsAids in moving chyme faster through the bodyPromotes small bowel motilityReleased by both enteroendocrine cells and neuronsReleased by sympathetic neurons and not enteroendocrine cells. Need Assignment Help?