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Gallbladder

The Gallbladder is defined as the pear-shaped organ that sits below the liver. Bile is concentrated and stored in the gallbladder.

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Additional Sources

Answers.com

A small, pear-shaped muscular sac, located under the right lobe of the liver, in which bile secreted by the liver is stored until needed by the body for digestion.

Encyclopedia Britannica

A muscular membranous sac that stores and concentrates bile, a fluid that is received from the liver and is important in digestion. Situated beneath the liver, the gallbladder is pear-shaped and has a capacity of about 50 ml (1.7 fluid ounces). The inner surface of the gallbladder wall is lined with mucous-membrane tissue similar to that of the small intestine. Cells of the mucous membrane have hundreds of microscopic projections called microvilli, which increase the area of fluid absorption.

MedicineNet

A pear-shaped organ just below the liver that stores the bile secreted by the liver. During a fatty meal, the gallbladder contracts, delivering the bile through the bile ducts into the intestines to help with digestion. Abnormal composition of bile leads to formation of gallstones, a process termed cholelithiasis. The gallstones cause cholecystitis, inflammation of the gallbladder.

Medline Plus

A membranous muscular sac in which bile from the liver is stored—called also cholecyst.

University of Maryland

The gallbladder is a sac located under the liver. It stores and concentrates the bile produced in the liver. Bile is released from the gallbladder in response to food, especially fats, in the upper small intestine.

Wikipedia

The gallbladder is a hollow system that sits just beneath the liver. In adults, the gallbladder measures approximately 8 cm in length and 4 cm in diameter when fully distended. It is divided into three sections: fundus, body and neck. The neck tapers and connects to the biliary tree via the cystic duct, which then joins the common hepatic duct to become the common bile duct. At the neck of the gall bladder is present a mucosal fold called Hartmann's pouch, where gall bladder stones commonly get stuck. The angle of the gallbladder is located between the costal margin and the lateral margin of the rectus abdominis muscle.
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