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Overview: Digestion and Absorption

Overview: Digestion and Absorption. NFSC 303 McCafferty. Digestion & Absorption: Overview. Digestion: breakdown of nutrients in the GI tract Mechanical and chemical Absorption: transfer of nutrients through the wall of the GI tract, into circulation Involved in D&A GI tract

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Overview: Digestion and Absorption

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  1. Overview:Digestion and Absorption NFSC 303 McCafferty

  2. Digestion & Absorption: Overview • Digestion: breakdown of nutrients in the GI tract • Mechanical and chemical • Absorption: transfer of nutrients through the wall of the GI tract, into circulation • Involved in D&A • GI tract • Auxiliary organs: ________________________________

  3. Pancreas: • Exocrine function: • Endocrine function: • Liver: (many functions…) • Digestive function: • Gallbladder

  4. Digestion • Mouth • Mechanical action: biting, chewing • Chemical action: • Saliva - • Enzymes – • Esophagus • Passage tube to stomach only • Muscular contractions propel food down

  5. Stomach • Mechanical “churning” and peristalsis • Chemical: • water • enzymes • HCl =

  6. Semi-liquid _______________ • Released into small intestine in small amounts

  7. Small Intestine • Most digestion and absorption occur here • Peristalsis and Segmentation • chyme mixed with more enzymes • bicarbonate (to reduce acidity), and • bile (involved in fat absorption) • “Lower” small intestine:

  8. Large Intestine (Colon): • Removes excess water and salts (electrolytes), forms feces. • Rectum and Anus: • Feces is held in rectum until eliminated through the anus.

  9. Absorption • Most absorption occurs in the small intestine… so let’s go back to the small intestine for a moment…

  10. Small intestine wall – thousands of folds

  11. Nutrients pass through the intestinal cells and then into blood or lymph • Capillaries: • Lymph vessels:

  12. Now we have all the nutrients on the inside of the body. • In the next section, we’ll learn all about 1)carbohydrates, 2) digestion and absorption of CHO, and 3) utilization of CHO once inside the body.

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