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Related Concept Videos

Microbiota of the Large Intestine01:27

Microbiota of the Large Intestine

The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
Microbiota of the Stomach and Small Intestine01:27

Microbiota of the Stomach and Small Intestine

The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...
Anatomy of the Intestines01:23

Anatomy of the Intestines

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 small...
Functions of the Gut Microbiota01:18

Functions of the Gut Microbiota

The gut microbiota includes trillions of microorganisms that colonize the human gastrointestinal tract, including bacteria, archaea, viruses, and fungi. This complex ecosystem plays a critical role in maintaining intestinal and systemic health. Most of these microbes inhabit the large intestine, establishing a relatively stable and diverse community that contributes to gut homeostasis through various metabolic, immunological, and protective mechanisms.Dominant bacterial phyla, such as...
Histology of the Small Intestine01:27

Histology of the Small Intestine

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...
Bacterial Flora of the Large Intestine01:29

Bacterial Flora of the Large Intestine

The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.

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Related Experiment Video

Updated: Jun 6, 2026

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
08:14

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes

Published on: May 8, 2016

Small intestine and microbiota.

Paul D Cotter1

  • 1Teagasc Food Research Centre, Moorepark, Fermoy and Alimentary Pharmabiotic Centre, Cork, Ireland. paul.cotter@teagasc.ie

Current Opinion in Gastroenterology
|November 25, 2010
PubMed
Summary
This summary is machine-generated.

Recent studies reveal the small intestinal microbiota

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An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
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An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions

Published on: June 30, 2021

Related Experiment Videos

Last Updated: Jun 6, 2026

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
08:14

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes

Published on: May 8, 2016

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions
05:27

An Intestinal Gut Organ Culture System for Analyzing Host-Microbiota Interactions

Published on: June 30, 2021

Area of Science:

  • Microbial Ecology
  • Human Microbiome Research

Background:

  • The small intestinal microbiota's composition has gained significant attention.
  • Advances in molecular tools have enabled deeper investigations.

Purpose of the Study:

  • To review recent studies on small intestinal microbiota composition.
  • To highlight its relevance to host health.

Main Methods:

  • Utilized new molecular tools for microbial ecology.
  • Focused on small intestinal microbiota in various diseases.

Main Results:

  • Investigated microbiota in celiac disease, inflammatory bowel disease, irritable bowel syndrome, and pouchitis.
  • Assessed the impact of invasive procedures on ileal microbiota.

Conclusions:

  • Increased understanding of the small intestinal microbiota-host health link.
  • Potential for targeted microbiota-altering strategies for disease prevention and treatment.