Monday, November 19, 2018

The Small Intestines

The Small Intestine

The site for nutrient digestion and absorbtion

Anatomy:

Pyloric sphincter
Duodenum
------- Trietz Ligament
Jejunum
Ileum



Structural Aspects, Secretions, and Digestive Processes of the Small Intestines

Cell types and secretions:

  • Enterocytes: glyocalyx - coat the villi, hydrolyze carbs and proteins
  • Unstirred water/fluid layer between enterocytes and brush border
  • Stem cells in Crypts of Lieberkuhn
  • Paneth cells - antimicrobial peptide (defensins), lyzozymes
  • Goblet cells - cysteine rich proteins with antifungal activity, and mucos
  • Brunner's glands - in submucosa,  mucous producing
  • Exocrine glands pancrea- bicarb



Regulation of Intestinal Motility and Secretions

VIP + intestinal motility
Glucagon - intestinal motility

Peristaltic waves:  11-12/min

Neural reflexes coordinates

Migrating motility or myoelectric complex (MMC) - weak contractions betwee meals.


No comments:

Post a Comment

Nutrition & Migraine Case

Nutrition & Migraine Case •         Mason Gasper •         U Bridgeport •         NUTR-560F-DLA-Func Nutritional Therapeut-201...