The Gallbladder is a small sacklike structure found under the liver. The cystic duct connects it to the common bile duct which leads to the small intestine. Bile is secreted by the liver continuously and flows into the gallbladder. The gallbladder is able to store 40-70 ml of bile. While stored, the bile becomes 5-10 times more concentrated. Cholecystokinin and the vagus nerve stimulate the gallbladder to contract after a meal. When the gallbladder contracts, large amounts of concentrated bile enters the duodenum of the small intestine.