Facilitated diffusion primarily depends on which of the following factors?

Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special proteins. This process primarily relies on the concentration gradient, which is the difference in the concentration of a substance inside and outside the cell.

When there is a higher concentration of a substance on one side of the membrane compared to the other, facilitated diffusion occurs as molecules move from an area of higher concentration to an area of lower concentration. This movement continues until equilibrium is reached, highlighting that the driving force behind facilitated diffusion is the concentration gradient rather than energy input from ATP or other sources.

While factors like pressure gradients, temperature, and membrane thickness can influence diffusion processes in general, they do not specifically define facilitated diffusion. The concentration gradient is the fundamental factor that determines the direction and rate of transport in this passive process.