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Facilitated Diffusion

OCR AS-level BiologyPlasma MembraneLesson 13 of 18

Like simple diffusion, facilitated diffusion is a passive process.

It relies on simple diffusion through a protein channel or carrier protein.

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Key terms in this lesson

ATP
Adenosine triphosphate, a nucleotide that acts as the immediate energy source of a cell, releasing energy when hydrolysed to ADP and inorganic phosphate.
diffusion
The net movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
active transport
The movement of molecules or ions across a membrane, often against their concentration gradient, using ATP and carrier proteins.

More in Plasma Membrane

All 18 lessons in Plasma Membrane · All OCR AS-level Biology topics