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Related Concept Videos

Bile01:19

Bile

Bile is a crucial bodily fluid, characterized by its yellow-green color and alkaline nature. Produced in the liver, it is transported through the common hepatic duct into either the cystic duct, leading to the gallbladder, or directly into the common bile duct. The flow of bile is regulated by the sphincter of Oddi located at the entrance of the duodenum. When this sphincter is closed, bile is redirected to the gallbladder for storage and concentration.
Bile is released when dietary fats enter...
Liver Physiology01:30

Liver Physiology

The liver, an essential organ in the human body, performs over 200 vital functions that can be broadly categorized into metabolic, hematological, endocrine regulation, and bile production.
Metabolic Regulation:
The liver is the central organ involved in regulating blood composition. It stabilizes blood glucose levels, maintaining them within the range of  70–110 mg/dL. When these levels drop, the liver breaks down glycogen reserves and releases glucose into the bloodstream. It can also...
Hepatic Drug Excretion: Influencing Factors01:16

Hepatic Drug Excretion: Influencing Factors

The biliary system of the liver, crucial for bile secretion and drug excretion, comprises intrahepatic bile ducts that merge to form the common hepatic duct. This duct, carrying hepatic bile, combines with the cystic duct, draining the gallbladder and forming the common bile duct, which empties into the duodenum. Bile, produced by hepatic cells lining the bile canaliculi, is composed primarily of water, bile salts, pigments, electrolytes, and lesser amounts of cholesterol and fatty acids. Bile...
Gallbladder01:17

Gallbladder

The gallbladder is a small, pear-shaped organ that plays a crucial role in our digestive system. Measuring about 10 cm in length, it is comparable in size to a kiwi fruit and is located in a hollow area on the lower surface of the liver. The gallbladder's primary function is to store and concentrate bile, a fluid produced by the liver that aids in digestion.
The gallbladder's anatomy consists of three regions: the fundus, body, and neck. Extending from the neck, the cystic duct joins the common...
Lipid Absorption01:24

Lipid Absorption

Dietary triglycerides from chyme in the duodenum are mixed with bile salts produced by the liver to emulsify fats. As a result, large droplets are broken down into smaller ones, increasing the surface area for enzymatic action. Once emulsified, pancreatic lipases hydrolyze the triglycerides into free fatty acids and monoglycerides.
These breakdown products bind with bile salts and lecithin to form micelles, which quickly pass between microvilli to come in close contact with the apical...
Accessory Organs01:31

Accessory Organs

Accessory organs are those that participate in the digestion of food but do not come into direct contact with it like the mouth, stomach, or intestine do. Accessory organs secrete enzymes into the digestive tract to facilitate the breakdown of food.

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Related Experiment Video

Updated: May 9, 2026

Extrahepatic Bile Duct and Gall Bladder Dissection in Nine-Day-Old Mouse Neonates
06:10

Extrahepatic Bile Duct and Gall Bladder Dissection in Nine-Day-Old Mouse Neonates

Published on: August 23, 2022

Bile formation and secretion.

James L Boyer1

  • 1Department of Medicine and Liver Center, Yale University School of Medicine, New Haven, Connecticut, USA. james.boyer@yale.edu

Comprehensive Physiology
|July 31, 2013
PubMed
Summary
This summary is machine-generated.

Bile secretion, essential for digestion, involves liver cells and bile ducts. Key transport proteins and osmotic gradients drive fluid movement, with genetic mutations revealing crucial functions.

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Area of Science:

  • Hepatobiliary science
  • Molecular biology
  • Physiology

Background:

  • Bile is a complex aqueous secretion produced by hepatocytes and modified by bile duct epithelium.
  • It contains organic and inorganic solutes, playing a vital role in digestion and detoxification.
  • The bile secretory unit comprises a canalicular network sealed by tight junctions.

Observation:

  • Bile canaliculi, approximately 1 μm in diameter, direct bile flow countercurrent to portal blood.
  • This network connects to the canal of Hering and progressively larger bile ducts.
  • Hormones, second messengers, and signal transduction pathways regulate cholangiocyte secretion.

Findings:

  • Canalicular bile secretion is regulated by both bile salt-dependent and independent transport systems.
  • Adenosine triphosphate-binding cassette transporters function as export pumps for bile salts and organic solutes.
  • These transporters generate osmotic gradients, driving fluid movement via aquaporins.

Implications:

  • Understanding bile secretion mechanisms is crucial for diagnosing and treating liver diseases.
  • Molecular characterization in animal models and humans reveals key determinants of bile flow.
  • Genetic mutations provide insights into the function of bile secretion components.