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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 or GI motility disorders are characterized by irregular gastrointestinal tract movements, disrupting food transit from the mouth to the anus. They are caused by damage or dysfunction in gut muscles or nerves. These disorders can cause symptoms such as severe constipation, diarrhea, abdominal pain, and swallowing difficulties. Disorders can affect any segment of the GI tract and range widely in severity, from common conditions like GERD to life-threatening conditions like...
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Enteric Nervous System: Regulation of GI Motor Activity01:11

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The Enteric Nervous System (ENS) plays a pivotal role in regulating gastrointestinal or GI motor activity. This complex network of nerves, deeply embedded within the gut wall, responds to changes in the gut environment and receives input from both the autonomic nervous system and the central nervous system. By doing so, the ENS operates various programs tailored to the body's nutritional status and needs.
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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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Fabrication and Implantation of Miniature Dual-element Strain Gages for Measuring In Vivo Gastrointestinal Contractions in Rodents.
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[MECHANISMS OF GASTRODUODENAL DYSMOTILITY UNDER STRESS].

V I Ovsiannikov, T P Berezina, K A Shemerovskii

    Eksperimental'Naia I Klinicheskaia Gastroenterologiia = Experimental & Clinical Gastroenterology
    |June 16, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Psychogenic stress disrupts rabbit gastroduodenal motility, inhibiting stomach activity while increasing duodenal contractile activity (CA). This stress-induced dysmotility can lead to duodenogastric reflux and gastric mucosal damage.

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    Area of Science:

    • Gastroenterology
    • Stress Physiology
    • Animal Physiology

    Background:

    • Psychogenic stress significantly impacts gastrointestinal function.
    • Understanding the mechanisms of stress-induced gut dysmotility is crucial for preventing related pathologies.

    Purpose of the Study:

    • To investigate the effects of psychogenic stress on gastroduodenal motility in rabbits.
    • To elucidate the neurochemical pathways involved in stress-induced changes in gut contractile activity.

    Main Methods:

    • Induction of psychogenic stress in rabbits.
    • Measurement of contractile activity (CA) in the stomach and duodenum.
    • Pharmacological characterization of the neural pathways involved (adrenergic, cholinergic).

    Main Results:

    • Stress inhibited contractile activity in the antrum and pylorus, while increasing it in the proximal and distal duodenum.
    • Gastric inhibition was primarily non-adrenergic, non-cholinergic, with an initial alpha-adrenergic phase.
    • Proximal duodenal CA increase was due to direct endocrine stress effects; distal duodenal CA increase involved beta-adrenergic stimulation of enteric cholinergic neurons.

    Conclusions:

    • Psychogenic stress causes significant dyscoordination of gastroduodenal motility.
    • This dysmotility may result in duodenogastric reflux and subsequent gastric mucosal erosions.
    • The findings highlight the complex interplay between stress, the nervous system, and gastrointestinal function.