Digestion And Absorption DLA Part 2

Question 1

Summarize carb digestion

Answer 1

Carbohydrates (CHO) are digested mainly to glucose, fructose and galactose.
CHO
1. Mouth: salivary a-amylase degrades starch and glycogen to dextrins, isomaltose and maltose.
Humans cannot digest cellulose (lost in feces).

2. Stomach: carbohydrate digestion stops.
3. Small intestine: pancreatic a-amylase forms isomaltose and maltose.
4. Brush border cells: disaccharidases cleave lactose, sucrose, isomaltose and maltose.

Question 2

Where are dissacharides cleaved?

Answer 2

At the brush border

Sucrase-isomaltase and maltase-glucoamylase are usually present at higher levels than lactase