Facilitated diffusion is the transport of materials across a cell membrane, driven by the potential energy of a concentration gradient. How is the rate of facilitated diffusion affected when a cell's surface-area-to-volume ratio is greatly increased? All facilitated diffusion stops when a cell's surface-area-to-volume ratio changes. Facilitated diffusion is unaffected by a cell's surface-area-to-volume ratio. The rate of facilitated diffusion is decreased. The rate of facilitated diffusion is increased. i think is c