NEET (NTA)-National Eligibility cum Entrance Test (Medical) Biology Human Physiology-Digestion and Absorption Revision (Page 3 of 23)

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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 comp

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Disorders due to abnormality in absorption

  • Enteritis is inflammation of intestine particularly of small intestine. There is passage of loose motion

  • Lactose intolerance: is caused because of deficiency of lactase enzyme in the brush border of the epithelium. In the infants it is not common but in the adults particularly of Asian origin it is very common. In the affected person lactose can not be digested and results in diarrhea and flatus formation. The disorder results in milk intolerance.

  • Hartnup disease: is rare autos

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