<Tr> <Td> Gastric inhibitory Peptide </Td> <Td> Endocrine K cells of the small intestine </Td> <Td> Beta cells of the pancreas </Td> <Td> Stimulates pancreatic insulin release </Td> <Td> Inhibits acid secretion </Td> <Td> None </Td> <Td> Satiety and lipid metabolism </Td> <Td> Glucose, fatty acid, and amino acids in small intestine </Td> </Tr> <Tr> <Td> Motilin </Td> <Td> Endocrine M cells in small intestine </Td> <Td> Smooth muscle of stomach and duodenum </Td> <Td> None </Td> <Td> None </Td> <Td> Stimulates migrating motor complex </Td> <Td> Action in brain, stimulates migratory motor complex </Td> <Td> Fasting: cyclic release every 1.5--2 hours by neural stimulus </Td> </Tr> <Tr> <Td> Glucagon - like peptide - 1 </Td> <Td> Endocrine cells in small intestine </Td> <Td> Endocrine pancreas </Td> <Td> Stimulates insulin release; inhibits glucagon release </Td> <Td> Possibly inhibits acid secretion </Td> <Td> Slows gastric emptying </Td> <Td> Satiety; various CNS functions </Td> <Td> Mixed meals of fats and carbohydrates </Td> </Tr> <Ul> <Li> carbohydrates (monosaccharide, disaccharide) </Li> <Li> proteins </Li> <Li> lipids </Li> </Ul>

Long and short reflexes of the digestive system