Glucose asorbed by co-transport in mamalian ileum

• Where is glucose absorbed into?


  Glucose is absorbed into the bloodstream in the small intestine
• what is the ileum?


  the final part of the small intestine
• How is glucose absorbed?


  glucose is absorbed by co-transport in the Mammalian Ileum
• Give details about the ileum?


  in the ileum, the concentration of glucose is too low for glucose to diffuse out of the blood

  so glucose is absorbed from the lumen (middle) of the ileum by co-transport
• What does glucose enter and with what?


  Glucose enters the ILEUM EPITHELIUM with SODIUM IONS
• How are sodium ions actively transported out of the ileum epithelial cells into the blood?


  by the sodium-potassium pump. This creates a CONCENTRATION GRADIENT- there is now a higher concentration of sodium ions in the lumen of the ileum than inside the cell
• what is the effect of the concentration gradient created by the sodium-potassium pump?


  • This causes sodium ions to diffuse from the lumen of the ileum into the epithelial cell, down their conc gradient
  • they do this via the sodium-glucose co-transporter proteins
• what does the co-transporter do?

  • Carries glucose into the cell with the sodium
  • As a result the concentration of glucose inside the cell increases
  • Glucose diffuses out of the cell, into the blood, down its concentration gradient through s PROTEIN CHANNEL by FACILITATED DIFFUSION
• What is sometimes needed to move a substance from A to B?


  several methods of transport are needed