CCK (CHLOECYSTOKININ
-stimulates bile and secretion of enzymes by pancreas
-stimulates digestion of fats and proteins
secretin
-regulate water balance and secretion from pancreas, stomach and liver
SUBSTANCE P
-initiates vomitting and stomach pain
VIP
-motility in gut
GIP
-induces insulin secretion from pancreas
NPY
-regulates hunger/eating behaviours