Question

What is correct about the movement of substance across the membrane in facilitated diffusion?

Answer 1

Facilitated diffusion requires a special protein channel and a concentration gradient and there is no ATP requirements

Answer 2

Facilitated diffusion, also called carrier-mediated osmosis, is the movement of molecules across the cell membrane via special transport proteins that are embedded in the plasma membrane by actively taking up or excluding ions. Active transport of protonsby H+ ATPases[2] alters membrane potentialallowing for facilitated passive transport of particular ions such as potassium down their charge gradient through high affinity transporters and channels.