Category A - full version without watermark 720x576 (check terms and conditions at www.teledesign.de) The version with watermark is for free to embed. The gallbladder is a hollow organ that sits in a concavity of the liver known as the gallbladder fossa. After being stored in the gallbladder the bile becomes more concentrated than when it left the liver, increasing its potency and intensifying its effect on fats. The bile, produced in the liver, emulsifies fats and neutralizes acids in partly digested food. Most digestion occurs in the duodenum.