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Cancer Health Library : GI Cancer


Cancer Types - Anatomy of the Biliary System

Illustration of the anatomy of the biliary system
Click Image to Enlarge

Anatomy of the biliary system:

The biliary system consists of the organs and ducts (bile ducts, gallbladder, and associated structures) that are involved in the production and transportation of bile. The transportation of bile follows this sequence:

  1. When the liver cells secrete bile, it is collected by a system of ducts that flow from the liver through the right and left hepatic ducts.
  2. These ducts ultimately drain into the common hepatic duct.
  3. The common hepatic duct then joins with the cystic duct from the gallbladder to form the common bile duct, which runs from the liver to the duodenum (the first section of the small intestine).
  4. However, not all bile runs directly into the duodenum. About 50 percent of the bile produced by the liver is first stored in the gallbladder, a pear-shaped organ located directly below the liver.
  5. Then, when food is eaten, the gallbladder contracts and releases stored bile into the duodenum to help break down the fats.

Functions of the biliary system:

The biliary system's main function includes the following:

  • to drain waste products from the liver into the duodenum
  • to help in digestion with the controlled release of bile

Bile is the greenish-yellow fluid (consisting of waste products, cholesterol, and bile salts) that is secreted by the liver cells to perform two primary functions, including the following:

  • to carry away waste
  • to break down fats during digestion

Bile salt is the actual component which helps break down and absorb fats. Bile, which is excreted from the body in the form of feces, is what gives feces its dark brown color.

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