Write about Gut Hormones here.

• Cholecystokinin (duodenum and jejunum) - increases gall bladder contraction, increases colonic motility.

• Gastrin (antrum and duodenum) - increases gastric acid secretion, increases GI mucosal growth, increases pancreatic secretion indirectly through binding with cholecystokinin.

• Secretin (duodenum and jejunum) - increases pancreatic bicarbonate production.

• VIP (enteric nerves) - increases intestinal secretion, splanchnic vasodilation.

• Pancreatic polypeptide (pancreas) - reduces biliary and pancreatic secretion.

• Peptide YY (ileum and colon) - inhibits pancreatic exocrine function.

• Neuropeptide Y (enteric nerves) - regulates intestinal blood flow.

• Motilin (whole gut) - increases small bowel motility.

• Bombesin (gut and pancreas) - stimulates pancreatic exocrine activity.

• Somatostatin (stomach and pancreas) - inhibits secretion and action of gut hormones.