11.1.4 Comparison of Different Transport Processes

Following Table gives a comparison of the different transport mechanisms.

PropertySimple DiffusionFacilitated TransportActive Transport
Requires special membrane proteinsNoYesYes
Highly selectiveNoYesYes
Transport saturatesNoYesYes
Uphill transportNoNoYes
Requires ATP energyNoNoYes

Proteins in the membrane are responsible for facilitated diffusion and active transport and hence show common characterstics of being highly selective; they are liable to saturate, respond to inhibitors and are under hormonal regulation.

But diffusion whether facilitated or not – take place only along a gradient and do not use energy.

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