Facilitated transport



A form of passive transport in which materials are moved across the plasma membrane by a transport protein down their concentration gradient ; hence, it does not require energy.


Examples are transport of polar molecules across the membrane by proteins that form transmembrane channels, and transport of large molecules like glucose by the conformational change of carrier proteins.

Synonym: facilitated diffusion.
Compare: active transport.
See also: passive transport, diffusion, carrier protein.

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