describe how each type of nutrient is absorbed by thesmall intestine.
describe how each type of nutrient is absorbed by the
small intestine.
absorption of carbohydrates : maximum of carbohydrates is absorbed in duodenum and jejunum which keeps on decreasing towards the terminal part of the ileum . the absorbable forms of carbohydrates are monosaccharides that are glucose galactose and fructose
the glucose is transported from lumen into the epithelial cells from there into the interstitium . From here glucose enters the blood
absorption of proteins : there are many transport systems for absorption of the amino acids seven such transport systems are known absorption of amino acids is greater in duodenum and jejunum and slower in ileum
absorption of lipids : the lipids are absorbed by the process of pasive diffusion and career mediated transport . when they enter the cell they get esterified . for the absorption of the lipids they are emusified in the intestine by the action of the bile salts lecithin and monoglycerides resulting in the formation of micelles . These micelles help in transport of lipids to the enterocytes
absoption of cholesterol : the cholesterol is easily absorbed by the intestines in the presence of bile , fatty acids and the pancreatic juice .
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