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Related Concept Videos

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.
Small Intestines
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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Small Intestine01:15

Small Intestine

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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.
The small intestine is divided into three main sections - the duodenum, jejunum, and ileum. The duodenum, approximately 25 cm long, is nearest the stomach. It acts as a 'mixing bowl,' where chyme (partially digested food) blends with digestive enzymes from the pancreas and liver. The duodenum's unique...
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Large Intestine01:09

Large Intestine

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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.
The ileocecal sphincter, a mucous membrane fold, guards the opening from the ileum to the large intestine. This valve permits material from the small intestine to pass into the large intestine. Attached to the ileocecal valve is the cecum. This small pouch, approximately 6 cm long, has a twisted, coiled tube known as...
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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.
The innermost mucosa layer comprises simple columnar epithelium, lamina propria, and muscularis mucosae. This layer is primarily populated with absorptive cells, tasked with water absorption, and goblet cells, responsible for secreting mucus to...
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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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DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Updated: Feb 5, 2026

Intestinal Epithelial Regeneration in Response to Ionizing Irradiation
09:10

Intestinal Epithelial Regeneration in Response to Ionizing Irradiation

Published on: July 27, 2022

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The intestinal epithelial response to damage.

Laura Weichselbaum1,2,3, Ophir D Klein4,5

  • 1Program in Craniofacial Biology and Department of Orofacial Sciences, University of California, San Francisco, CA, 94143, USA.

Science China. Life Sciences
|September 9, 2018
PubMed
Summary
This summary is machine-generated.

Intestinal stem cells (ISCs) regenerate the gut lining. Upon injury, progenitor cells regain stemness to repair the intestinal epithelium, highlighting crucial intercellular communication.

Keywords:
intestinemicroenvironmentregeneration

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Area of Science:

  • Gastroenterology and Regenerative Medicine
  • Stem Cell Biology
  • Epithelial Biology

Background:

  • The intestinal epithelium constantly renews itself, relying on intestinal stem cells (ISCs) at the crypt base.
  • ISCs generate transit-amplifying progenitor cells during normal conditions (homeostasis).
  • The intestinal epithelium's ability to regenerate after injury is critical for tissue repair.

Purpose of the Study:

  • To review the mechanisms of intestinal epithelial regeneration following damage.
  • To explore the interplay between different intestinal compartments during repair.
  • To understand how cues from immune, mesenchymal, and microbial cells influence epithelial homeostasis.

Main Methods:

  • This review synthesizes existing research on intestinal epithelial regeneration.
  • It focuses on the cellular and molecular responses to intestinal injury.
  • The review examines the communication networks involving stem cells, progenitor cells, and surrounding stromal and immune cells.

Main Results:

  • Intestinal stem cells (ISCs) are essential for maintaining the gut lining.
  • Following injury, progenitor cells can dedifferentiate, regaining stemness to repopulate the ISC pool.
  • Epithelial cells integrate signals from immune cells, mesenchymal cells, and the microbiome to orchestrate repair.

Conclusions:

  • The intestinal epithelium possesses a robust regenerative capacity, primarily driven by ISCs and adaptable progenitor cells.
  • Intercellular communication between epithelial, mesenchymal, immune, and microbial components is vital for successful regeneration and homeostasis.
  • Understanding these complex interactions offers therapeutic targets for intestinal diseases.