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Related Concept Videos

Physiology of the Gastrointestinal System II: Digestion and Absorption01:22

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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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The physiology of the gastrointestinal system begins with ingestion as food enters the mouth.
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The gastrointestinal elimination process involves a complex interplay of neural and hormonal mechanisms that coordinate the final waste removal from the body. This intricate operation encompasses the absorption of water and electrolytes, vital for transforming the remaining indigestible food matter into feces. The large intestine is pivotal in water and electrolyte absorption, forming feces from unabsorbed minerals, undigested food, bacteria, bile pigments, and shed epithelial cells. Essential...
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The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of the...
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The human stomach is a vital part of the digestive system, performing multiple functions. It is located within the peritoneum, a serous membrane that lines the abdominal cavity. The stomach plays a central role in processing food substances and interacts with other digestive organs through coordinated digestive processes. The stomach has a characteristic J-shape and is divided into four main regions. The cardia is the first section where the esophagus connects to the stomach and is the entry...
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Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
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Gastrointestinal Physiology and Function.

Beverley Greenwood-Van Meerveld1, Anthony C Johnson2, David Grundy3

  • 1University of Oklahoma and VA Medical Center, Oklahoma City, OK, USA. Beverley-Greenwood@ouhsc.edu.

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Summary
This summary is machine-generated.

This review explores gastrointestinal (GI) physiology and common GI diseases. Understanding brain-gut interactions is crucial for developing new treatments for conditions like irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD).

Keywords:
AbsorptionBarrier functionCentral nervous system (CNS)ColonConstipationDiarrheaDigestionEnteric nervous system (ENS)Epithelial barrierGut microbiomeInflammationInflammatory bowel disease (IBD)Intestinal permeabilityIrritable bowel syndrome (IBS)MucosaSecretionSmall intestineSmooth muscleStressVisceral pain

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Area of Science:

  • Gastroenterology and Physiology
  • Neurogastroenterology

Background:

  • The gastrointestinal (GI) system facilitates digestion and nutrient absorption.
  • GI physiology is influenced by factors like microbiota, stress, inflammation, and aging.
  • Common GI disorders include IBS and IBD, often presenting with abdominal pain, bloating, and altered bowel habits.

Purpose of the Study:

  • To review overall GI tract function and factors affecting it.
  • To emphasize neural regulation and brain-gut interactions in GI modulation.
  • To highlight the need for novel therapeutics for challenging GI diseases.

Main Methods:

  • Review of existing literature on GI physiology and pathophysiology.
  • Focus on neural regulation and brain-gut communication pathways.
  • Discussion of factors impacting GI function and disease.

Main Results:

  • GI disorders are prevalent and often difficult to diagnose and manage.
  • Brain-gut interactions are clinically relevant to GI complaints.
  • Understanding pathophysiology, particularly gut-brain communication, is key for therapeutic development.

Conclusions:

  • Enhanced understanding of gut physiology and pathophysiology, especially gut-brain communication, is vital.
  • Targeting brain-gut pathways offers therapeutic potential for functional gut disorders and inflammatory conditions like IBD.
  • Further basic research is essential to develop effective treatments for GI diseases.