Being the part of the Biliary System its main purpose is storing of Bile or Gall. It acts as a reservoir for Bile produced by Liver. Bile produced by the Liver flows to the Gallbladder through Bile ducts. In response to a hormone Cholecystokinin (a Peptide Hormone of Gastrointestinal Tract) released by the small intestine, Gallbladder releases the Bile. The function of this Bile is to break off large Fat molecules into smaller ones. After it has done its job, Bile is reabsorbed from the intestine and goes back to liver (Enterohepatic circulation). During the storage in Gallbladder the Bile becomes more potent and intensely effects on fats.