<prompt> 1 cells of duodenum secreteSecretinGastrinCCKMotilin  <response>: Enteroendocrine cells EEC secrete key gastrointestinal GI hormones such as gastric-inhibitory peptide GIP, cholecystokinin CCK and ghrelin that are involved in nutrient sensing pathways and are often implicated in GI pathology. EEC is also known as I cells. Ref: 