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Detail mechanism of absorption of some nutrients

Absorption of carbohydrates

  • absorption of carbohydrates only occurs when they are converted to monosaccharides. They are absorbed in duodenum and upper part of jejunum.
  • Absorption of glucose and galactose is with the help of a cotransporter called symporter. The glucose molecules enter with in the cell together with Na+ ions by the help of SGLT-1 a sodium dependent glucose transporter (symporter). Presence of glucose facilitates the absorption of Na+ ions
  • Glucose and galactose compete with each other for the absorption.
  • Fructose is absorbed by separate carrier GLUT-5 (glucose transporter).
  • Glucose, galactose and fructose all enter in blood from… (678 more words) …

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Digestive Glands - Small intestine and intestinal glands

Histological characteristics of small intestine; it contains 4 layers – mucosa (mucous membrane), submucosa, muscular layer and serous (peritoneal layer). The mucous membrane has following special features;

  • Surface area of small intestinal mucosa is only 2.5 sq. meter but it is greatly increased by

  1. Presence of folds of kerckring (Dutch anatomist) theseare circular folds present in mucosa. They are also called Circular plica or Valvulae conniventes

  2. Presence of villi; mucous membrane of the small intestine shows finger

  3. Presence of microvilli each intestinal cell has a brush border formed of microvilli. This increases the surface area further.

These three facts… (414 more words) …

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