Liver Function and Biliary System Lecture

Overview of Liver and Bile

• Liver lobe and bile secretion discussed.
• Bile flows through the common hepatic duct.

Components of Bile

• Bile consists of:
  • Bile pigments: perform coloring function, not essential for bile function.
  • Bile salts: essential for emulsification, help in fat absorption.

Role of Bile Salts

• Aid in emulsifying fats.
• Convert fats into micelles for absorption in the ileum.

Biliary System

• Liver synthesizes bile but does not store it.
• Bile moves through the common hepatic duct.
• First storage: bile ducts.
• Next organ: gallbladder (stores bile until needed).

Gallbladder and Hormonal Control

• Gallbladder's function: stores bile.
• Hormone cholecystokinin (CCK) triggers bile release.
• Procedure: Cholecystectomy (gallbladder removal).

Pathway of Bile

• Bile synthesized in the liver.
• Flows through common hepatic duct to bile duct, stored in gallbladder.
• Hormone CCK causes gallbladder contraction, releasing bile.
• Bile flows through the cystic duct into the common bile duct.
• Final storage: common bile duct, releases bile into the digestive tract at the duodenum.

Function of Bile in Digestion

• Bile emulsifies fats in the duodenum.
• Bile salts and fats absorbed in the ileum.
• Bile salts return to liver for reuse.

Key Processes and Pathways

• Liver: bile synthesis.
• Common Hepatic Duct: bile flow.
• Gallbladder: bile storage.
• CCK Hormone: triggers bile release.
• Common Bile Duct: final bile storage and release into duodenum.
• Duodenum: emulsification of fats.
• Ileum: absorption of bile salts and fats.
• Liver: recycle bile salts.

Summary

• Biliary system: liver, ducts, gallbladder, and hormones work together for bile production, storage, release, and recycling.