Phys 66: GI Digestion and Absorption Flashcards
Major reaction of digestion
Hydrolysis
Major diet carbs
Sucrose
Lactrose
Starches
What happens to cellulose
Nothing, it cant be digested by humans
Where does carbohydrate digestion begin
In mouth by saliva enzyme (ptyalin)
Most of carbohydrate digestion is done by
Pancreatic amylase
Way more powerful than salivary amylase
Hydrolysis of small glucose polymers is done by ____
via ____ enzymes
Where
Enterocytes
lactase, sucrase, maltase
intestine
Pepsin function
Cleaves proteins into smaller peptides. Real work is done down the line by pancreatic enzymes but pepsin is needed to iniate
Pepsin pH activity
Most active at pH 2-3
Inactive at pH 5
Collagen is digested by (enzyme)
Pepsin
Carboxylpolypeptidase function
Cleaves individual amino enzymes from peptide ends
Hydrolysis of neutral fats is catalyzed by
Lipase
First step of fat digestion
Emulsification of fat by bile acids and lecithin
Tryglycerides are digested by
Pancreatic lipase
Phospholipids hydrolized by
Phospholipase A2
Total intestinal fluid absorption per day
8-9 liters