Common for CCK and Gastrin:

Gastrin stimulates mucosal growth of the stomach and small and large intestines (trophic action). CCK exes a trophic effect on the pancreas. Gastrin secretion is increased by the presence of the products of protein digestion in the stomach, paicularly amino acids. The secretion of CCK is increased by contact of the intestinal mucosa with the products of digestion, paicularly peptides and amino acids, and also by the presence in the duodenum of fatty acids containing more than 10 carbon atoms. Gastrin increases while CCK decreases gastric emptying.