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Related Concept Videos

Gross Anatomy of the Stomach01:16

Gross Anatomy of the Stomach

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...
Stomach pH Regulation01:21

Stomach pH Regulation

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.
The acid-secreting gastric mucosal epithelial cells (parietal cells) lining the stomach lumen maintain the low pH in the lumen. Numerous ion transporters and channels on these parietal...
Gastric Motility01:16

Gastric Motility

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...
Gastric Emptying01:16

Gastric Emptying

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...
Gastric Phase of Digestion01:26

Gastric Phase of Digestion

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...
Hormones Secreted by the Stomach01:25

Hormones Secreted by the Stomach

Enteroendocrine cells, accounting for only 1% of stomach epithelial cells, play a significant role in digestion and are classified by their digestive hormone secretions.
Each of these hormones secreted by different enteroendocrine cells plays a unique role in digestion. Here are a few examples:

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Gross Dissection of the Stomach of the Lobster, Homarus Americanus
10:12

Gross Dissection of the Stomach of the Lobster, Homarus Americanus

Published on: May 22, 2009

The electrifying stomach.

K L Koch1

  • 1Section on Gastroenterology, Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA. kkoch@wfubmc.edu

Neurogastroenterology and Motility
|August 16, 2011
PubMed
Summary
This summary is machine-generated.

Pigs exhibit gastric dysrhythmias similar to cardiac arrhythmias, offering insights into human stomach electrical disorders. This research could advance understanding and electricity-based therapies for gastrointestinal motility issues.

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Area of Science:

  • Gastroenterology
  • Electrophysiology
  • Comparative Medicine

Background:

  • The stomach exhibits electrical activity, including normal slow waves and abnormal dysrhythmias like tachygastrias and bradygastrias.
  • Gastric dysrhythmias in humans are poorly understood, impacting motility and causing upper GI symptoms.
  • Interstitial cells of Cajal function as the stomach's pacemaker, with cellular loss or faulty circuitry implicated in dysrhythmias.

Purpose of the Study:

  • To describe and categorize porcine gastric dysrhythmias using electrocardiology principles.
  • To explore the relevance of pig gastric dysrhythmias to human conditions and potential electricity-based therapies.
  • To draw analogies between gastric and cardiac neuromuscular disorders to advance neurogastroenterology.

Main Methods:

  • Utilized printed circuit boards with multi-electrode arrays (160-192 electrodes) attached to the serosa of anesthetized pigs.
  • Recorded and analyzed gastric electrical activity, identifying dysrhythmias manually and by computer.
  • Compared observed patterns to known cardiac dysrhythmia classifications.

Main Results:

  • Gastric dysrhythmias were observed in 8 out of 16 pigs.
  • The patterns of dysrhythmias, including conduction blocks, ectopic foci, and aberrant waves, were reminiscent of cardiac dysrhythmias.
  • Identified regular and irregular tachygastrias in the porcine subjects.

Conclusions:

  • Porcine gastric dysrhythmias share similarities with human gastric dysrhythmias, suggesting pigs as a relevant model.
  • The categorization of porcine dysrhythmias may aid in understanding the spectrum of human gastric dysrhythmias.
  • Further research in gastric electrophysiology labs is crucial for advancing the understanding and treatment of human gastric dysrhythmias and upper GI symptoms.