Absorption of glucose in the ileum
- Created by: Eema003
- Created on: 24-02-16 12:13
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- Absorption
- Increasing the rate of movement across membranes
- The epithelial cells lining the ileum possess micro-villi
- 0.6 um in length
- Provide more surface area for the insertion of carrier proteins.
- Increase the number of channel and carrier proteins
- Increase their density.
- The epithelial cells lining the ileum possess micro-villi
- Diffusion
- The net movement of of molecules from a region of high concentration to a region of low concentration
- Higher concentration of glucose and amino acids within the ileum than the blood
- Glucose therefore moves down a concentrated gradient (facilitated diffusion)from the ileum to the blood.
- The blood is constantly being circulated by the heart.
- Glucose is constantly being removed from the blood by cells to be used up in respiration
- This helps to maintain the concentration gradient.
- Glucose is constantly being removed from the blood by cells to be used up in respiration
- Active transport
- Diffusion only results in the concentrations becoming equal
- This means that not all glucose and amino acids are absorbed.
- To stop this active transport is absorbing the glucose and amino acids
- Therefore all the glucose and amino acids should be absorbed by the blood.
- To stop this active transport is absorbing the glucose and amino acids
- This means that not all glucose and amino acids are absorbed.
- Diffusion only results in the concentrations becoming equal
- Increasing the rate of movement across membranes
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