11.1.4 Comparison of Different Transport Processes

Following Table gives a comparison of the different transport mechanisms.

Property Simple Diffusion Facilitated Transport Active Transport
Requires special membrane proteins No Yes Yes
Highly selective No Yes Yes
Transport saturates No Yes Yes
Uphill transport No No Yes
Requires ATP energy No No Yes

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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