1 / 16

A Comprehensive Guide to Digestion and Absorption in NFSC 303

Explore the breakdown and transfer of nutrients in the gastrointestinal tract, including mechanical and chemical processes. Learn about organs like the pancreas, liver, and gallbladder involved in digestion, from mouth to small intestine, colon, rectum, and anus. Discover how nutrients are absorbed through the wall of the small intestine.

lrainwater
Download Presentation

A Comprehensive Guide to Digestion and Absorption in NFSC 303

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related