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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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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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Bacterial Flora of the Large Intestine01:29

Bacterial Flora of the Large Intestine

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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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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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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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Digestive Functions of the Large Intestine01:20

Digestive Functions of the Large Intestine

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The large intestine is where the final stages of digestion happen. When the cecum receives chyme, it contains undigested carbohydrates that undergo fermentation. Gut bacteria ferment these carbohydrates to produce short-chain fatty acids that provide some energy and help synthesize essential vitamins.
As the chyme moves to the colon, it triggers two characteristic sluggish contractions - haustral churning and mass peristalsis. Haustral churning involves the rhythmic contraction and relaxation...
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Updated: Dec 31, 2025

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota
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Probiotics, Nutrition, and the Small Intestine.

Taylor C Judkins1, Douglas L Archer1, Dean C Kramer2

  • 1Food Science and Human Nutrition Department, University of Florida, 572 Newell Dr., Gainesville, FL, 32611, USA.

Current Gastroenterology Reports
|January 14, 2020
PubMed
Summary

Probiotics can support a healthy small intestine (SI) microbiome, improving nutrient absorption and reducing SI disease. Understanding probiotic benefits and limitations is key for effective therapeutic use.

Keywords:
Dysbiosis, intestinal permeabilityMicrobiotaNutritionProbioticsSmall intestine

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Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis
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Area of Science:

  • Microbiology
  • Gastroenterology
  • Nutritional Science

Background:

  • Probiotics are beneficial for small intestine (SI) health and disease management.
  • A healthy SI microbiome (eubiosis) is crucial for nutrient absorption and overall health.
  • Dysbiosis can impair nutrient utilization and contribute to SI diseases.

Purpose of the Study:

  • To review the role of probiotics in maintaining SI eubiosis.
  • To understand the advantages and limitations of probiotic therapies for SI health.
  • To explore the impact of probiotics on nutrient absorption and SI disease pathology.

Main Methods:

  • Literature review of studies on probiotics and small intestine health.
  • Analysis of research on microbial dysbiosis and its effects.
  • Evaluation of clinical evidence for probiotic efficacy in SI conditions.

Main Results:

  • Probiotic supplements, particularly those with lactic acid bacteria and Bifidobacterium, can support beneficial SI microbes.
  • Probiotics have shown potential in improving SI barrier integrity and reducing nutrient malabsorption.
  • Strain-specific probiotic therapy may restore SI eubiosis, enhancing nutrient absorption and health outcomes.

Conclusions:

  • Probiotics offer a promising therapeutic avenue for managing SI diseases.
  • Optimizing SI microbiome balance through probiotics can improve nutrient status and reduce disease incidence.
  • Further research into strain-specific probiotics is warranted for targeted SI health interventions.