Factors affecting rate of diffusion

14. Oct. 2014, 11:00 Cell membrane function

1. FACTORS AFFECTING THE RATE OF DIFFUSION CELL MEMBRANE

2. Summary of Membrane Transport

3. Diffusion of Nonelectrolytes Simple diffusion

4. Concentration Gradient ( CA − CB)

5. Partition Coefficient ( K) Solubility of a solute in oil relative to its solubility in water

6. Diffusion Coefficient ( D) Size of the solute molecule Viscosity of the medium

7. Thickness of the Membrane (ΔX ) The thicker the cell membrane, the lower the rate of diffusion .

8. Surface Area (A ) The greater the surface area of membrane available, the higher the rate of diffusion

9. Diffusion of Electrolytes Facilitated Diffusion Primary Active Transport Secondary Active Transport Cotransport Countertransport

10. Saturation Carrier proteins have a limited number of binding sites for the solute

11. Stereospecifity The binding sites for solute on the transport proteins are stereospecific

12. Competition Chemically related solutes can be recognized, bound , and get transport, thereby occupying some of the binding sites of other solutes

13. Reference: Costanzo Physiology 5 th edition