Diffusion stops when the concentration of the substance is equal in both areas. This does not mean that the molecules of substance are not moving any more, just that there is no overall movement in one direction. Molecules of substance are moving equally in both directions.

Does facilitated diffusion stop?

Facilitated diffusion requires the assistance of proteins. Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. ... At equilibrium, movement of molecules does not stop.

What limits facilitated diffusion?

Chained carriers, shown in (b), have limited diffusion because they are covalently bound in the polymer membrane. In this key result for facilitated diffusion, the flux is zero when the diffusion coefficient is zero. by the solute-carrier reaction cannot diffuse from one side of the membrane to the other.