Facilitated Diffusion vs Diffusion

[luvinpurple]

What is facilitated diffusion? I can't find a place that explains it so I can understand it. I have to compare facilitated diffusion and simple diffusion but I can't figure out what facilitated diffusion is.

If you know anything about this topic please help. Thanks!

[JackBean]

try this
http://biology.about.com/od/cellularpro ... fusion.htm
http://biology.about.com/od/cellularpro ... sion_2.htm

if you'll still have troubles understanding, tell us what's your problem.