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Related Concept Videos

Gastric Motility01:16

Gastric Motility

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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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The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
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Gastric emptying occurs when the stomach gradually releases chyme into the duodenum. When the stomach is distended, it triggers the release of gastrin, a hormone that promotes gastric acid secretion to aid in digestion. Additionally, stomach distension contributes to peristaltic waves that propel gastric contents toward the pyloric region. The gastroenteric reflex, on the other hand, primarily stimulates peristalsis in the intestines, facilitating the movement of contents further along the...
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The human body contains a monogastric digestive system. In a monogastric digestive system, the stomach only contains one chamber in which it digests food. Several other animal species also have monogastric digestive systems, including pigs, horses, dogs, and birds. This chapter, however, focuses on the human digestive system.
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The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
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Related Experiment Video

Updated: Jan 12, 2026

In vitro Digestion of Emulsions in a Single Droplet via Multi Subphase Exchange of Simulated Gastrointestinal Fluids
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Gastric Mixing and Acid Diffusion in a Human Stomach Simulated Using Smoothed Particle Hydrodynamics.

Xinying Liu1,2, Simon M Harrison2, Shouryadipta Ghosh2

  • 1School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia.

Journal of Food Science
|November 8, 2025
PubMed
Summary

Computational stomach models reveal that gastric motility significantly enhances mixing, but acid diffusion is the primary driver of acid distribution. Higher viscosity slows mixing, while antral contraction waves create anisotropic flow patterns.

Keywords:
acid diffusiondigestiongastric mixingsmoothed particle hydrodynamicsstomach

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Area of Science:

  • Computational fluid dynamics
  • Gastrointestinal physiology
  • Biomedical engineering

Background:

  • Gastric digestion involves complex mechanical and chemical processes.
  • Accurate modeling of stomach function is crucial for understanding digestion and nutrient absorption.

Purpose of the Study:

  • To develop a computational stomach model using smoothed particle hydrodynamics (SPH).
  • To investigate the influence of fluid viscosity, gastric motility, and acid diffusion on gastric mixing and acid distribution.

Main Methods:

  • Utilized smoothed particle hydrodynamics (SPH) for computational modeling.
  • Incorporated antral contraction waves (ACW) and acid diffusion from the stomach wall.
  • Analyzed the anisotropic mixing patterns generated by ACWs.

Main Results:

  • Gastric motility, specifically ACW speed and occlusion, significantly enhances gastric mixing.
  • Higher fluid viscosity leads to slower and less efficient mixing.
  • Acid diffusion coefficient is the dominant factor in acid distribution, surpassing mechanical mixing effects.

Conclusions:

  • Gastric mixing patterns are anisotropic, driven by tangential flow along ACWs.
  • While mechanical mixing is vital for fluid dynamics, chemical diffusion dictates acid distribution and pH changes.
  • Accurate gastric models require consideration of both mechanical and chemical processes for digestion and absorption insights.