Category B - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The version with watermark is for free to embed. - Description: The gallbladder is a sac that stores bile made by the liver in between meals. After a meal, the gallbladder squeezes the bile it has stored into the intestine. In the intestine, the bile mixes with food and fat. Bile is important because it helps with the digestion of fat and its transfer from the intestine into the body. Gallstones can occur anywhere within the biliary tree, including the gallbladder and the common bile duct. Cholesterol gallstones develop when bile contains too much cholesterol and not enough bile salts. Incomplete and infrequent emptying of the gallbladder may cause the bile to become overconcentrated and contribute to gallstone formation. Also the presence of proteins in the liver and bile can either promote or inhibit cholesterol crystallization into gallstones.