How are the proteins used for active transport different from those used for facilitated diffusion?

Proteins involved in active transport are called pumps and require energy, usually from ATP, to move substances against their concentration gradient. In contrast, proteins used for facilitated diffusion are channels or carriers that allow molecules to passively move down their concentration gradient without energy input. This means that active transport can concentrate substances inside or outside the cell, while facilitated diffusion helps equalize concentrations on both sides of the membrane.