Absorbtion In The Small Intestine

A sheet on absorbtion in the small intestine

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  • Created by: Emma
  • Created on: 28-04-12 11:43
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1) Na+ ions actively transported out of
epithelial cells, by sodium-potassium
pump, into blood. Takes place in on type
of protein carrier molecule in cell surface
membrane.
2) Higher conc. Of Na+ ions in lumen of
intestine instead of inside epithelial cells.
3) Na+ ions diffuse into epithelial cells
down conc gradient through different
type of protein carrier. As Na+ ions go
back in through this second carrier
protein they couple with the glucose
molecules, which are carried into the cell
with them.
4) Glucose passes into blood plasma by
facilitated diffusion using another type of
carrier protein.

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