Gastrointestinal Motility

by Thad Wilson, PhD

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    Hello! Today, we’re going to talk about GI motility. We’re going to cover a number of important topics and the first of which is to try to explain how GI motility works. And this will include three important aspects including peristalsis, slow waves, and migrating motor complexes. Then, what we’re going to do is talk about how swallowing is initiated and controlled. And finally, we will explain how gastric emptying works and how this process is regulated and controlled. So let’s go back to our GI functions and determine which ones we’re going to cover today. And that is excretion, storage, and most importantly, motility. To discuss motility, we need to go through a little bit deeper on the various layers of the GI tract. These layers go from the mucosal layer, which is the most innermost, to the serosal layer, which is the most outermost. So the nerves are going to be controlling the muscular activity, the mucosal cell or layer, then that is the layer of muscle around the mucosal layer. Then we have a couple of plexus. The Meissner plexus and the submucosal plexus. The submucosa, and this is important, this circular layer of muscle. And finally, the Auerbach complex, and the longitudinal layer. So you notice there were three different layers of muscles in the GI tract. And this will be important in being able to squeeze the GI tract together and to be able to push items along this particular tube. And of course, the final layer is the serosa. Now, how this process works is through an intricate process known as persitalsis. Now, peristalsis is a way of coordinating muscle contraction and this is smooth muscle contraction. So you’re going to use acetylcholine at the site to cause a contraction. We need to relax...

    About the Lecture

    The lecture Gastrointestinal Motility by Thad Wilson, PhD is from the course Gastrointestinal Physiology. It contains the following chapters:

    • Gastrointestinal Motility
    • Swallowing
    • Gastric Motility
    • Intestinal Motility
    • Slow Waves
    • Learning Outcomes

    Included Quiz Questions

    1. Acetylcholine
    2. Nitric oxide
    3. Vasoactive intestinal peptide
    4. Enkephalin
    1. carbohydrates
    2. proteins
    3. nucleic acids
    4. fats
    1. Small intestine
    2. Esophagus
    3. Stomach
    4. Large intestine

    Author of lecture Gastrointestinal Motility

     Thad Wilson, PhD

    Thad Wilson, PhD

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    By Eda D. on 01. March 2017 for Gastrointestinal Motility

    easy to understand, clear explanations. Couldn't decide details were enough or not.