What is facilitated diffusion?
This is when proteins in the cell membrane are used to transfer a solute from one side of the membrane to another. When the solute binds to the protein this causes a conformational change in the shape of the protein causing it to flip and carry the solute across the membrane. The solute then dissociates from the protein and it has moved from a high concentration to a low concentration. Glucose and amino acids rely on facilitated diffusion. Facilitated diffusion does not require energy.