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Related Concept Videos

Hepatic Drug Excretion: Influencing Factors01:16

Hepatic Drug Excretion: Influencing Factors

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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...
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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.
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Hepatic Drug Excretion: Enterohepatic Cycling01:17

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Enterohepatic cycling involves the active secretion of drugs and their metabolites into the bile via transporters in the canalicular membrane of hepatocytes. This secretion is an integral part of the digestive process, releasing these substances into the gastrointestinal (GI) tract.
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Gallbladder01:17

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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.
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Cholecystitis is inflammation of the gallbladder, most commonly caused by obstruction of the cystic duct. This blockage prevents bile from draining, leading to gallbladder distension, inflammation, and potentially serious complications. This condition may present acutely or chronically and can happen with or without gallstones.EtiologyAbout 95% of cholecystitis cases are calculous, caused by gallstones blocking the cystic duct, leading to bile accumulation and inflammation of the gallbladder...
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Related Experiment Video

Updated: May 5, 2026

Positron Emission Tomography Using 64-Copper as a Tracer for the Study of Copper-Related Disorders
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Biliary copper excretion in the chicken.

C I Rosenblum1, R M Leach

  • 1Department of Poultry Science, The Pennsylvania State University, 16802, University Park, PA.

Biological Trace Element Research
|November 22, 2013
PubMed
Summary
This summary is machine-generated.

Chicken biliary copper excretion involves binding to large protein aggregates and smaller compounds. Elevated copper levels shift this distribution, increasing binding to the smaller compound.

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Area of Science:

  • Biochemistry
  • Animal Physiology
  • Trace Element Metabolism

Background:

  • Biliary copper excretion is a key route for copper homeostasis.
  • Understanding the molecular forms of copper in bile is crucial for metabolic studies.

Purpose of the Study:

  • To characterize the nature of biliary copper excretion in chickens.
  • To investigate how altered dietary copper affects copper binding in chicken bile.

Main Methods:

  • Collection of gallbladder and hepatic bile from chickens on varied diets.
  • Fractionation of bile using gel filtration chromatography and SDS-PAGE.

Main Results:

  • Control chickens excreted copper bound mainly to a >600,000 dalton protein aggregate and secondarily to a 7400 dalton compound.
  • Elevated biliary copper led to a significant increase in copper associated with the secondary 7400 dalton compound.
  • Observed excretion patterns in chickens resemble steady-state rat bile, differing from other rat studies.

Conclusions:

  • Chicken biliary copper excretion involves distinct molecular forms.
  • Copper distribution in bile is sensitive to changes in copper homeostasis.
  • This study provides insights into avian copper metabolism and excretion mechanisms.