Protein digestion process and production site details
Absorption: Absorption is the process by which the end products of digestion pass though the intestinal epithelium and enter into the blood stream.
Process of carbohydrate absorption:
Glucose – by sodium co-transport or secondary active transport
Galactose – Bysodium co-transport
Fructose – By facilitated diffusion.
Site of carbohydrate absorption.
CH2O is absorbed in-
Brush border of intestinal epithelial cell of cell of duodenum and upper jejunum.
Mechanism of carbohydrate absorption-
A.Absorption of glucose and galactose-
Glucose and galactose are transport when Na+ is transported with the help of carrier protein.
Na+ Binds with carrier protein and transported from intestine to interior of the intestinal epithelial cell with the help of energy. At the same time it pulls the glucose and galactose along with it. Now, from the cell glucose and galactose are transported into blood by facilitated diffusion
B.Absorption of fructose-
Fructose is transported by facilitated diffusion. In the cell fructose becomes phosphorylated, then converted to glucose and finally transported into blood.
Fate of glucose after absorption-
1. Produce energy and heat.
2. Store as glycogen in liver and muscle.
Form of protein that absorption-
1. Amino acid
Process of protein absorption, Mechanism and sites:
By secondary active transport
Protein in absorbed in the brush border of intestinal epithelium of duodenum and upper jejunum.
Protein is absorbed in the from of amino acid. Amino acid is transported when Na+ is transported by binding with carrier protein. Na+ binds with carrier protein and moves down its concentration gradient to interior of the cell. At the same time along with it pulls protein.
Now from the cell amino acid is transported into blood by facilitated diffusion.