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Related Concept Videos

Lipid Absorption01:24

Lipid Absorption

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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...
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Carbohydrate Absorption01:25

Carbohydrate Absorption

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Carbohydrates are essential macronutrients that serve as the body's primary energy source. Their digestion begins in the mouth, where salivary amylase partially breaks down complex carbohydrates such as starch into smaller oligosaccharides. This mechanical and enzymatic activity prepares carbohydrates for further processing in the gastrointestinal tract.
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...
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Glucose Absorption Into the Small Intestine01:26

Glucose Absorption Into the Small Intestine

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Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and...
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Carrier-Mediated Transport01:06

Carrier-Mediated Transport

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Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
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Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
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Factors Influencing Drug Absorption: Anatomical Parameters01:23

Factors Influencing Drug Absorption: Anatomical Parameters

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Drug absorption involves the movement of drugs from the point of administration into the systemic circulation. Initially, Gastrointestinal (GI) motility propels the drug through the digestive tract and into the stomach. However, the stomach's high acidity and limited surface area restrict its role in drug absorption for most drugs. The drug then moves from the stomach to the small intestine via gastric emptying, which can be slowed by various factors, including interactions with other...
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Related Experiment Video

Updated: Mar 5, 2026

The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
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The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion

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Developments in intestinal cholesterol transport and triglyceride absorption.

Yared Paalvast1, Jan Freark de Boer, Albert K Groen

  • 1aDepartment of Pediatrics bDepartment of Laboratory Medicine, University of Groningen, University Medical Center Groningen cDepartment of Vascular Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.

Current Opinion in Lipidology
|March 25, 2017
PubMed
Summary
This summary is machine-generated.

Recent research highlights the intestine

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Related Experiment Videos

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The Isolation of Flowing Mesenteric Lymph in Mice to Quantify In Vivo Kinetics of Dietary Lipid Absorption and Chylomicron Secretion
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Area of Science:

  • Gastroenterology
  • Cardiovascular Research
  • Metabolic Diseases

Background:

  • Intestinal lipid handling is crucial for cholesterol and triglyceride homeostasis.
  • Atherosclerosis risk is linked to cholesterol transport and excretion rates.
  • Understanding intestinal cholesterol absorption is key to managing cardiovascular events.

Purpose of the Study:

  • To review recent advancements in intestinal lipid handling research.
  • To explore novel factors regulating cholesterol excretion and lipid absorption in the intestine.

Main Methods:

  • Review of mechanistic studies in mice and human data.
  • Focus on transintestinal cholesterol excretion pathway.
  • Investigation of bile acid receptor (FXR) and phospholipid remodeling (LPCAT3) roles.

Main Results:

  • Transintestinal cholesterol excretion accounts for 35% of fecal cholesterol in humans.
  • Farnesoid X receptor activation enhances cholesterol excretion and reduces plasma lipids.
  • Phospholipid remodeling via LPCAT3 is vital for fatty acid uptake by enterocytes.

Conclusions:

  • The intestine plays a significant role in cholesterol and triglyceride balance.
  • Novel factors influencing cholesterol excretion and lipid absorption present therapeutic targets.
  • Targeting intestinal lipid handling pathways may offer new strategies for dyslipidemia treatment.