Factors affecting rate of diffusion

4,828 views 14 slides Nov 04, 2014
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14. Oct. 2014, 11:00 Cell membrane function


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FACTORS AFFECTING THE RATE OF DIFFUSION CELL MEMBRANE

Summary of Membrane Transport

Diffusion of Nonelectrolytes Simple diffusion

Concentration Gradient ( CA − CB)

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

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

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

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

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

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

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

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

Reference: Costanzo Physiology 5 th edition
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