Physio - Carb Digestion and Reabsorption

L57

What are the two paths for absorption?

1. Transcellular → cross luminal membrane via passive diffusion or transporters

2. Paracellular → between cells via tight junctions

What’s the purpose of the Folds of Kerckring?

Increases SA for more contact time → slows digesta movement

What’s the purpose of the villi and microvilli in the SI lumen?

Lined with enterocytes for absorption and goblet cells for mucus secretion

Microvilli → brush border for final absorption

How much is SA increased with the folds, villi and microvilli?

600X

What’s the turnover rate of epithelial cells of the intestinal mucosa?

Q 3-6 days

What type of carbohydrate is high in horse, cattle and sheep diets?

Cellulose

What type of carbohydrate is high in performance horse and finishing cattle diets?

Starch

What type of carbohydrate is high in chicken and pig diets?

Starch

What two carbohydrates are mainly found in dog diets?

Starch and soluable fiber

What two carbohydrates are mainly found in cat diets?

Starch and glycogen

Which of these are considered monosaccharides?

glucose, fructose, ribose

Which of these are considered disaccharides?

sucrose, lactose, maltose

Which of these are considered polysaccharides?

starch, cellulose, glycogen, hemicellulose