Digestion & Absorption

by Thad Wilson, PhD

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    Hello! In this particular lecture, we’re going to go through a number of very important topics. We’re going to talk specifically about both absorption and digestion. Here, we're going to specifically focus on understanding how carbohydrates, fats, proteins are digested and identify the enzymes that are primary involved in these processes. We will also talk about the absorption of basic macronutrients, ions, and water as well as other electrolytes as they enter places like the portal vein or the lymphatic circulation. Finally, we’re going to focus on the various portions of the splanchnic circulation that will help deliver this food stuff to the rest of the body and therefore provide the energy needed in undergoing normal daily activities. So digestion, absorption, these are what our main topics will be for today’s lecture. Just to give you an overall kind of review of what specific items are going to be most important. Today, we’re going to discuss absorption and digestion. This is primarily going to occur in places like the reaction vessel in the stomach, the catalytic and absorptive surface in the small intestine. But we’re going to need some supply of enzymes from places like the enzyme supplier from the pancreas. So digestion in a simplistic format is simply going to be taking a molecule from the intestinal lumen and moving it across the epithelial cells into the interstitial space so it can be picked up by the blood. Using a classic example of glucose, glucose can simply travel through these enterocytes to be able to be absorbed. Things that are a little bit more complex such as proteins, might need to broken down into individual amino acids or very short peptides to be able to be transported. Complex carbohydrates or even simple carbohydrates such as sucrose still need to...

    About the Lecture

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

    • Digestion & Absorption
    • Digestion
    • Absorption
    • Splanchnic Circulation
    • Learning Outcomes

    Included Quiz Questions

    1. Alpha 1,4
    2. Alpha 1,6
    3. Beta 1,4
    4. Beta 1,6
    1. Carboxypeptidase
    2. Chymotrypsin
    3. Pepsin
    4. Elastase
    1. GLUT5
    2. GLUT4
    3. SGLT1
    4. SGLT2
    1. Hydrogen ions
    2. Sodium
    3. Chloride
    4. Bicarbonate
    1. Vitamin D3
    2. Thyroxin
    3. Intrinsic factor
    4. Cholecystokinin

    Author of lecture Digestion & Absorption

     Thad Wilson, PhD

    Thad Wilson, PhD

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