Facilitated diffusion and simple diffusion are both passive transport mechanisms that move molecules down a concentration gradient without requiring energy. Facilitated diffusion utilizes transport proteins to assist in the movement of molecules across the membrane.
Facilitated diffusion is similar to simple diffusion in that it does not require energy and follows a concentration gradient. The difference is that it is a carrier-mediated transport mechanism that uses special transport proteins to facilitate movement of molecules across the membrane.
Facilitated diffusion is exemplified by the transport of sugar and amino acids into RBCs and the CNS. It allows for faster movement of larger molecules that have difficulty diffusing through the membrane without assistance.
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