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Related Concept Videos

Gastrointestinal Motility Disorders01:20

Gastrointestinal Motility Disorders

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...
Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation01:30

Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation

Irritable Bowel Syndrome II: Clinical Features and Diagnostic Evaluation
Irritable Bowel Syndrome (IBS) is classified into subtypes based on the predominant bowel habits as determined by the Bristol Stool Form Scale (BSFS). The subtypes are:
Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and solid...
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...

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Related Experiment Video

Updated: Jul 8, 2026

In vitro Functional Characterization of Mouse Colorectal Afferent Endings
14:09

In vitro Functional Characterization of Mouse Colorectal Afferent Endings

Published on: January 21, 2015

Variability of colonic function in healthy subjects.

J B Wyman, K W Heaton, A P Manning

    Gut
    |February 1, 1978
    PubMed
    Summary

    Normal colonic function exhibits significant day-to-day variability in transit time and stool output. This natural variation in gastrointestinal transit is crucial for interpreting experimental data and designing future studies.

    Area of Science:

    • Gastroenterology
    • Human Physiology
    • Digestive System Function

    Background:

    • Understanding the normal day-to-day variations in colonic function is essential for accurate physiological research.
    • Previous studies may not have fully accounted for the inherent variability in human bowel habits.

    Purpose of the Study:

    • To quantify the day-to-day variability in colonic transit time and other fecal parameters in healthy individuals.
    • To assess the influence of sex and menstrual cycle on these variations.

    Main Methods:

    • Healthy subjects (n=20) collected stool over five-day periods across multiple weeks.
    • Transit time was measured using Hinton's method.
    • Fecal weight, volume, frequency, and water content were analyzed.

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    In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats

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    Two-dimensional Porcine Intestinal Organoids Reflecting the Physiological Properties of Native Gut
    09:13

    Two-dimensional Porcine Intestinal Organoids Reflecting the Physiological Properties of Native Gut

    Published on: January 31, 2025

    Related Experiment Videos

    Last Updated: Jul 8, 2026

    In vitro Functional Characterization of Mouse Colorectal Afferent Endings
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    In vitro Functional Characterization of Mouse Colorectal Afferent Endings

    Published on: January 21, 2015

    In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats
    08:19

    In Vitro Characterization of the Electrophysiological Properties of Colonic Afferent Fibers in Rats

    Published on: September 27, 2017

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    09:13

    Two-dimensional Porcine Intestinal Organoids Reflecting the Physiological Properties of Native Gut

    Published on: January 31, 2025

    Main Results:

    • Significant day-to-day variations were observed in colonic transit time, fecal weight, volume, and defecation frequency.
    • Individual stool size showed substantial variability (up to tenfold).
    • Fecal water content remained relatively constant; no significant sex or menstrual cycle differences were found.

    Conclusions:

    • Normal colonic function displays considerable day-to-day variability.
    • This inherent variability must be considered when designing experiments and interpreting data related to gut physiology.
    • The findings highlight the need for robust study designs that accommodate natural fluctuations in bowel function.