Carbohydrates

Absorption of Carbohydrates

Absorption of monosaccharides takes place in the small intestine. The cells of the small intestine called enterocytes only absorb the simplest form of sugars.

                            

  Glucose and galactose enter the enterocyte by secondary active transport, here ATP is used and higher concentration of sodium pulls glucose and galactose into the cell.

Fructose enters the cell through passive transport which is does not requires ATP. The concentration should be higher in the intestinal lumen than in the absorptive cells which enquires permeability.

          After glucose, fructose and galactose enters the villi, they are transported by passive diffusion into the blood stream and reaches the liver for metabolism.