What type of transport does facilitated diffusion represent?

Facilitated diffusion is indeed classified as passive-mediated transport. This process occurs when molecules move across a cell membrane through specific transmembrane proteins, allowing them to bypass the lipid bilayer. Unlike active transport, which requires energy input to move substances against their concentration gradient, facilitated diffusion relies on the natural movement of molecules from an area of higher concentration to an area of lower concentration. Since this process does not require energy, it represents a passive transport mechanism mediated by proteins such as channel or carrier proteins.

The distinction is crucial: facilitated diffusion is specifically for molecules that cannot easily pass through the membrane without assistance—these include polar molecules and ions. Therefore, the characteristics of facilitated diffusion clearly align with passive-mediated transport, solidifying it as the correct classification.