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4 Cards in this Set
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Co-Transport & absorption of glucose in the ileum |
●Glucose is absorbed into the bloodstream in the small intestine-ileum (final part of mammals small intestine) ●concentration of glucose is too low for glucose to diffuse out into blood,so glucose is absorbed from the lumen of the ileum by Co transporters ●Co-Transporters are a type of carrier protein ●they bind two molecules at a time ●concentration gradient of 1 molecule is used to move the other molecule against its own concentration gradient |
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Ileum |
Epithelial cells lining the ileum have micro villi, finger like projections to increase the surface area They also have an increased number of protein channels & carrier molecules in their membrane |
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Method of Co-Transport |
1.●Sodium ions actively tansported out of epithelial cells in the ileum,into the blood by the sodium-potassium pump ●This creates a conc gradient,as there is a higher conc of sodium ions in the lumen of the ileum than inside the cell
2.●sodium ions diffuse from lumen of ileum to to epithelial cells down their concentration gradient,Via sodium-glucose Co-transporter protein ●Co transporter carries glucose into cell with sodium,so conc of glucose inside cell increases
3.●Glucose diffuses out of cell into blood down conc gradient through protein channel,by facilitated diffusion |
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Comparison of methods of transport |
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