Molecules that permeate a plasma membrane by facilitated diffusion:

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Facilitated diffusion involves the use of transport proteins to move molecules across the plasma membrane. This process does not require an expenditure of energy (unlike active transport) and typically moves molecules from an area of high concentration to an area of low concentration (also unlike active transport). The rate of facilitated diffusion is dependent on the number of available transport proteins, so it may be faster or slower than simple diffusion depending on the circumstances.

Molecules That Permeate a Plasma Membrane by Facilitated Diffusion