Factors affecting rate of diffusion

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FACTORS AFFECTING THE RATE OF DIFFUSION CELL MEMBRANE

Transcript of Factors affecting rate of diffusion

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F A C T O R S A F F E C T I N G T H E R A T E O F D I F F U S I O N

CELL MEMBRANE

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Summary of Membrane Transport

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Diffusion of Nonelectrolytes

Simple diffusion

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Concentration Gradient (CA − CB)

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Partition Coefficient (K)

Solubility of a solute in oil relative to its solubility in water

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Diffusion Coefficient (D)

Size of the solute molecule

Viscosity of the medium

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Thickness of the Membrane (ΔX)

The thicker the cell membrane, the lower the rate of diffusion.

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Surface Area (A)

The greater the surface area of membrane available, the higher the rate of diffusion

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Diffusion of Electrolytes

Facilitated Diffusion

Primary Active Transport

Secondary Active Transport

Cotransport

Countertransport

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Saturation

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

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Stereospecifity

The binding sites for solute on the transport proteins are stereospecific

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Competition

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

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Reference:

Costanzo Physiology 5th edition