1. Membrane Transport
Dr. Sadaf Mumtaz
9/12/11

3. Unassisted transport Diffusion
Random motion of molecules among one another in liquids or in gases
Concentration gradient/Chemical gradient
Difference in concentration between two adjacent areas
Net Diffusion
Difference between two opposing movements
Steady state

4. Fick’s Law of Diffusion
Net rate of diffusion = C. P. A
MW. D
Membrane potential or electrical gradient

5. Diffusion through protein channels

6. Osmosis
Net movement of water caused by concentration difference of water.

7. Carrier Mediated transport
Specificity
Saturation
Competition

8. Assisted Membrane transport
Facilitated diffusion
Active transport
Secondary active transport

9. Facilitated diffusion

10. Active transport

11. Na-K pump

12. Secondary active transport

13. Counter-transport

14. Thanks
5th Jan 2010