Following Table gives a comparison of the different transport mechanisms.
|Property||Simple Diffusion||Facilitated Transport||Active Transport|
|Requires special membrane proteins||No||Yes||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.