Facilitated diffusion is the passive movement of materials across the cell membrane with the aid of transport proteins, enabling substances to diffuse from higher to lower concentration without cellular energy expenditure.
Facilitated diffusion is the movement of materials across the cell membrane with the help of transport proteins, allowing substances to diffuse from higher to lower concentration without the cell expending energy. This process is essential for transporting ions or polar molecules that cannot easily pass through the membrane via simple diffusion.
Facilitated diffusion is distinct from active transport, which requires energy input to move substances against their concentration gradient. In contrast, facilitated diffusion moves substances down their concentration gradient.
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