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Related Concept Videos

Gastric Emptying01:16

Gastric Emptying

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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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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.
Peristaltic Waves and Chyme Formation
Upon food entry, the stomach initiates...
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Gastric Phase of Digestion01:26

Gastric Phase of Digestion

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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.
When food enters the stomach, it stretches the stomach walls and activates stretch receptors. This triggers local reflexes of the enteric nervous system, mediated through the myenteric plexus. These...
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Neural Regulation01:37

Neural Regulation

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Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
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Hormonal Regulation01:40

Hormonal Regulation

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Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.
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What is Monogastric Digestion?01:50

What is Monogastric Digestion?

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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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Related Experiment Video

Updated: Feb 9, 2026

A Protocol for Roux-en-Y Gastric Bypass in Rats using Linear Staplers
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A Protocol for Roux-en-Y Gastric Bypass in Rats using Linear Staplers

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Gastric bypass.

E G Flickinger1, D R Sinar, M Swanson

  • 1Department of Surgery, East Carolina University School of Medicine, Greenville, North Carolina.

Gastroenterology Clinics of North America
|June 1, 1987
PubMed
Summary
This summary is machine-generated.

Gastric bypass success involves more than just stomach size restriction. It also includes factors like dumping and malabsorption from intestinal changes, combining restrictive and malabsorptive elements.

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Last Updated: Feb 9, 2026

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Area of Science:

  • Bariatric surgery
  • Gastroenterology
  • Surgical innovation

Background:

  • Gastric bypass is a common bariatric procedure.
  • Its success is often attributed to gastric restriction.

Purpose of the Study:

  • To investigate factors contributing to gastric bypass success beyond simple restriction.
  • To understand the combined mechanisms of gastric bypass.

Main Methods:

  • Analysis of outcomes in gastric bypass patients.
  • Review of physiological changes post-surgery.

Main Results:

  • Gastric bypass success is influenced by factors beyond pouch and outlet size.
  • Postoperative dumping and mild malabsorption play significant roles.
  • Intestinal content redirection contributes to long-term outcomes.

Conclusions:

  • Gastric bypass functions as both a restrictive and malabsorptive procedure.
  • Success is multifactorial, involving both mechanical restriction and physiological changes.