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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...
Overview of Fatty Acid Metabolism01:28

Overview of Fatty Acid Metabolism

Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
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...
Lipid-derived Compounds in the Human Body01:31

Lipid-derived Compounds in the Human Body

Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and glycolipids, also play unique roles to support various  biological processes .
Fat-soluble Vitamins
Fat-soluble vitamins, including vitamins A, D, E, and K, are required in minimal quantities, but their deficiencies can lead to severely abnormal physiological conditions. For example, vitamin A deficiency can cause night blindness, dry skin, delayed...

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Related Experiment Video

Updated: Jun 20, 2026

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
08:42

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport

Published on: November 27, 2016

Bile acids have the gall to function as hormones.

Thomas Quad de Aguiar Vallim1, Peter A Edwards

  • 1Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, BSRB Room 310, Los Angeles, CA 90095, USA.

Cell Metabolism
|September 3, 2009
PubMed
Summary

Specific activation of the G protein-coupled receptor TGR5, activated by bile acids, enhances pancreatic and liver function. This activation also prevents obesity development when fed a high-fat diet.

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

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Last Updated: Jun 20, 2026

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
08:42

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport

Published on: November 27, 2016

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

Area of Science:

  • Metabolic research
  • Endocrinology
  • Gastroenterology

Background:

  • The bile-acid-activated G protein-coupled receptor TGR5 (also known as GPBAR1) plays a role in metabolic regulation.
  • Understanding TGR5's specific functions is crucial for developing therapeutic strategies against metabolic disorders.

Discussion:

  • This study investigates the effects of targeted TGR5 activation on metabolic health.
  • The research explores how modulating TGR5 signaling impacts key metabolic organs like the pancreas and liver.
  • The findings suggest a potential therapeutic avenue for managing diet-induced obesity.

Key Insights:

  • Specific activation of TGR5 improves pancreatic function.
  • TGR5 activation enhances hepatic function.
  • Targeting TGR5 impairs the development of obesity in a high-fat diet model.

Outlook:

  • Further research into TGR5 agonists could lead to novel treatments for obesity and related metabolic conditions.
  • Exploring the downstream signaling pathways of TGR5 will be essential for understanding its full therapeutic potential.
  • Investigating the long-term effects and safety of TGR5 activation is warranted.