Why does the facilitated diffusion go with the concentration gradient?

Facilitated diffusion occurs along the concentration gradient because it relies on the natural tendency of molecules to move from areas of higher concentration to areas of lower concentration, seeking equilibrium. This process involves specific transport proteins that help polar or charged substances cross the cell membrane without expending energy. By utilizing these proteins, cells can efficiently transport essential molecules like glucose or ions while still adhering to the laws of thermodynamics. Ultimately, facilitated diffusion is a passive transport mechanism that harnesses the inherent kinetic energy of the molecules involved.