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Related Concept Videos

Factors Influencing Drug Absorption: Disease States and Pharmacology01:25

Factors Influencing Drug Absorption: Disease States and Pharmacology

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Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
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Physiology of the Gastrointestinal System II: Digestion and Absorption01:22

Physiology of the Gastrointestinal System II: Digestion and Absorption

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The gastrointestinal (GI) tract, extending from the mouth to the anus, plays a pivotal role in the digestion and absorption of nutrients. This process involves both mechanical and chemical actions facilitated by various enzymes.
Digestion begins in the mouth, where food undergoes mechanical breakdown by chewing and combines with saliva. Salivary amylase, an enzyme in saliva, starts the breakdown of starches into maltose. The food then travels down the esophagus to the stomach.
In the stomach, a...
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Absorption of Nutrients01:19

Absorption of Nutrients

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Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...
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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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Protein Absorption01:12

Protein Absorption

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Proteins in the gastrointestinal tract typically come from food, but they can also originate from disintegrated cells or secreted enzymes. In the stomach, the enzyme pepsin breaks down these proteins into polypeptides. The fragments then move into the duodenum as a semi-fluid mass called chyme. Pancreatic proteases, such as trypsin and chymotrypsin, and intestinal brush border enzymes like carboxypeptidases further dismantle the polypeptides into tripeptides, dipeptides, and free amino acids.
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Histology of the Small Intestine01:27

Histology of the Small Intestine

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The small intestine exhibits a unique histological structure that significantly enhances its function in digestion and nutrient absorption. These structures include circular folds, villi, and various specialized cells that collectively facilitate the digestion of food.
The intestinal lining features transverse folds called circular folds, each housing fingerlike projections known as intestinal villi. These villi are covered by a layer of simple columnar epithelium, also referred to as...
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Related Experiment Video

Updated: Apr 5, 2026

Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
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The Pathophysiology of Malabsorption.

Jutta Keller1, Peter Layer1

  • 1Department of Internal Medicine, Israelitic Hospital, University of Hamburg, Germany.

Viszeralmedizin
|August 20, 2015
PubMed
Summary
This summary is machine-generated.

Gastrointestinal nutrient absorption relies on complex functions, and disturbances can cause malabsorption syndromes. This article details various pathomechanisms affecting digestion and nutrient uptake.

Keywords:
Gastric acid secretionMalabsorptionMaldigestionMotility disturbancesPancreatic exocrine insufficiency

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Area of Science:

  • Gastroenterology
  • Human Physiology
  • Nutritional Science

Background:

  • Physiological digestion and nutrient absorption involve intricate gastrointestinal motor, secretory, digestive, and absorptive functions.
  • These complex processes are susceptible to disturbances, potentially leading to malabsorption syndromes.

Purpose of the Study:

  • To illustrate various pathomechanisms underlying malabsorption syndromes.
  • To highlight how disruptions in gastrointestinal functions can impair nutrient digestion and absorption.

Main Methods:

  • Review and synthesis of known pathomechanisms affecting gastrointestinal digestion and absorption.
  • Categorization of malabsorption causes based on affected physiological functions (e.g., mechanical breakdown, transit time, secretion, mucosal integrity).

Main Results:

  • Identified pathomechanisms include impaired mechanical breakdown (chewing, antral contractility), reduced transit time (dumping syndrome), insufficient digestive secretions (gastric acid, pancreatic, biliary), enteral mucosal defects (enzyme deficiencies, transporter issues), and mucosal loss (short bowel syndrome).

Conclusions:

  • Malabsorption syndromes arise from diverse disturbances impacting specific or global gastrointestinal functions.
  • Understanding these pathomechanisms is crucial for diagnosing and managing malabsorption disorders.