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The gallbladder is a small organ that aids mainly in digestion of fat and concentrates bile produced by the liver. The gallbladder stores about 50 ml of bile (gall) until the body needs it to be released when food containing fat enters the digestive tract, stimulating the secretion of cholecystokinin. The gallbladder is 10-12 cm long and appears dark green because of the contents (bile) rather than its tissue.