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Anatomy of the Intestines01:23

Anatomy of the Intestines

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Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
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The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the...
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Cystic Fibrosis: Pathogenesis01:23

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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
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Cystic Fibrosis: Management01:24

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Cystic fibrosis (CF) is an autosomal recessive disorder that predominantly affects individuals of Northern European descent, occurring at a rate of 1 in 3500. It is caused by a genetic mutation in a gene on chromosome 7, most commonly the ΔF508 mutation, that codes for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. This results in thicker mucus secretions and obstruction pathologies in multiple organs, including the lungs and sinuses.
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Small Intestine01:15

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The small intestine is primarily responsible for digestion and nutrient absorption. It spans from the pyloric sphincter to the ileocecal valve and connects to the large intestine.
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Large Intestine01:09

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The large intestine is divided into three main regions: the cecum, colon, and rectum. Extending from the ileocecal valve to the anus, it frames the small intestine on three sides.
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Histology of the Large Intestine01:26

Histology of the Large Intestine

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The large intestine, a vital component of the gastrointestinal tract, is structured with four main layers: the mucosa, submucosa, muscularis, and serosa. Each layer performs a distinct role in facilitating the smooth functioning of the large intestine.
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Related Experiment Video

Updated: Feb 3, 2026

Chronic Salmonella Infection Induced Intestinal Fibrosis
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Chronic Salmonella Infection Induced Intestinal Fibrosis

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Intestinal fibrosis.

Marco Vincenzo Lenti1, Antonio Di Sabatino1

  • 1First Department of Internal Medicine, San Matteo Hospital Foundation, University of Pavia, Pavia, Italy.

Molecular Aspects of Medicine
|November 3, 2018
PubMed
Summary
This summary is machine-generated.

This study reviews gut fibrosis mechanisms, a common outcome in chronic gastrointestinal conditions like inflammatory bowel disease. Understanding these fibrotic processes is key to developing new antifibrotic therapies for gut healing.

Keywords:
CollagenCrohn's diseaseExtracellular matrixMyofibroblastStrictureplastyUlcerative colitis

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Area of Science:

  • Gastroenterology
  • Pathology
  • Immunology

Background:

  • Extensive tissue fibrosis is a common end-stage complication in chronic gastrointestinal diseases such as inflammatory bowel disease, ulcerative jejunoileitis, and radiation enteritis.
  • Fibrogenesis, a normal repair process, can become detrimental when persistent inflammation leads to excessive scar tissue formation, causing organ damage and dysfunction.

Purpose of the Study:

  • To summarize current knowledge on the mechanisms driving gut fibrosis.
  • To provide a clinical perspective on fibrotic processes in the gastrointestinal tract.
  • To identify potential therapeutic targets for antifibrotic treatments.

Main Methods:

  • Review of existing literature on gut fibrosis mechanisms.
  • Analysis of the role of persistent inflammation in fibrogenesis.
  • Focus on the interplay between immune and non-immune cells in tissue remodeling.

Main Results:

  • Persistent inflammation is a common factor sustaining fibrogenic processes across various gastrointestinal fibrotic conditions.
  • Growth factors, proteolytic enzymes, and pro-fibrogenic cytokines are key mediators.
  • Interactions between myofibroblasts, fibroblasts, monocytes, macrophages, and T-cells are crucial for progressive tissue damage.

Conclusions:

  • Gut fibrosis involves complex interactions driven by persistent inflammation.
  • Understanding these mechanisms is essential for developing effective antifibrotic therapies.
  • Targeting these pathways offers potential for treating chronic gastrointestinal fibrotic diseases.