<prompt> Which of the following factor increases gastric motility?Acid in duodenumFatty food in stomachCarbohydrate in stomachNone of the above  <response>: Fats, carbohydrates, and acid in the duodenum inhibit gastric acid and pepsin secretion and gastric motility neural and hormonal mechanisms. The messenger involved is probably peptide YY. CCK has also been implicated as an inhibitor of gastric emptying. Hyperosmolality of the duodenal contents is sensed by duodenal osmoreceptors that initiate a decrease in gastric emptying, which is probably neural in origin. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. 2012. Chapter 27. Gastrointestinal Motility. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks Eds, Ganongs Review of Medical Physiology, 24e. 