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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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What is a Hypothesis?01:14

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A hypothesis can be a simple sentence or statement about a property or any phenomenon observed or predicted for a population. It is usually a claim about a  property of the population. It can be stated for any field observations or experiments. A hypothesis statement cannot be said to be right or wrong as it is merely a statement. It needs to be tested through an elaborate data collection process and an appropriate statistical test. A hypothesis should be a general but not a vague...
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Types of Hypothesis Testing01:11

Types of Hypothesis Testing

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There are three types of hypothesis tests: right-tailed, left-tailed, and two-tailed.
When the null and alternative hypotheses are stated, it is observed that the null hypothesis is a neutral statement against which the alternative hypothesis is tested. The alternative hypothesis is a claim that instead has a certain direction. If the null hypothesis claims that p = 0.5, the alternative hypothesis would be an opposing statement to this and can be put either p > 0.5, p < 0.5, or p...
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Errors In Hypothesis Tests01:14

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When performing a hypothesis test, there are four possible outcomes depending on the actual truth (or falseness) of the null hypothesis and the decision to reject or not.
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Hypothesis Test for Test of Independence01:16

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The test of independence is a chi-square-based test used to determine whether two variables or factors are independent or dependent. This hypothesis test is used to examine the independence of the variables. One can construct two qualitative survey questions or experiments based on the variables in a contingency table. The goal is to see if the two variables are unrelated (independent) or related (dependent). The null and alternative hypotheses for this test are:
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Gastric Emptying01:16

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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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Mouse Models Of Helicobacter Infection And Gastric Pathologies
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GASTRIC MOTILITY HYPOTESIS.

M D Levin, Z Korshun, G Mendelson

    Eksperimental'Naia I Klinicheskaia Gastroenterologiia = Experimental & Clinical Gastroenterology
    |June 12, 2018
    PubMed
    Summary
    This summary is machine-generated.

    This study proposes a new hypothesis on gastric motility, explaining how the lower esophageal sphincter and pyloric sphincter control food movement and pressure dynamics in the stomach, particularly in gastroesophageal reflux disease.

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    Area of Science:

    • Gastroenterology
    • Radiology
    • Digestive System Physiology

    Background:

    • Understanding gastric motility is crucial for diagnosing and treating digestive disorders.
    • Existing models of gastric emptying do not fully explain pressure dynamics and sphincter function.
    • Gastroesophageal reflux disease (GERD) involves complex interactions between esophageal and gastric sphincters.

    Purpose of the Study:

    • To propose a novel hypothesis on gastric motility.
    • To elucidate the roles of the gastric cardia and pyloric sphincter in regulating stomach emptying.
    • To explain observed radiological findings in the context of gastric pressure and motility.

    Main Methods:

    • Retrospective analysis of 344 radiological studies of the upper digestive tract.
    • Comprehensive review and analysis of existing medical literature.
    • Formulation of a hypothesis based on anatomical and physiological principles.

    Main Results:

    • The gastric cardia's tone increases with intra-gastric pressure, acting as part of the lower esophageal sphincter (LES).
    • In GERD, cardia insufficiency leads to angular stomach deformity and reduced gas bubble size.
    • Pyloric sphincter (PS) opening is pressure-dependent, with evacuation influenced by position and antral pressure.
    • Phased stomach emptying is regulated by the coordinated action of the antral cavity, duodenal bulb, and pyloric sphincter.

    Conclusions:

    • The proposed hypothesis integrates the functions of the gastric cardia and pyloric sphincter in gastric motility.
    • Radiological findings, including angular deformity, can be explained by pressure-induced sphincter dysfunction.
    • This model provides a unified explanation for gastric emptying mechanisms under various physiological and pathological conditions.