Facilitated diffusion involves spontaneous passive transport (as opposed to active transport) of molecules or ions across a biological membrane via specific transmembrane integral proteins.
-For instance; in the cell, examples of molecules that must use facilitated diffusion to move in and out of the cell membrane are glucose, sodium ions, and potassium ions. These molecules pass using carrier proteins through the cell membrane without energy along the concentration gradient.
The right answer to this question is facilitated diffusion. This process involves the help of a carrier that can be outside the cell or it can be transported through a transmembrane protein.
There are a lot of distinct processes of carrying something inside and outside the cell, but all of them have something in common, they need to have the right concentration to do so, if they don't have this, it'll probably not happen and the process is not going to work. The facilitated diffusion works in a way that the nutrient moves from a higher solute area to a lower solute area, just as it's described on the question, but the main thing right here is for you to learn how this process occurs, and not only this one, but all kinds of tranportation.
