Biology / Bio 0341 · Atom · ~20 seconds
Facilitated Transport
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Facilitated transport moves a substance down its existing concentration gradient with the help of a membrane protein, using no cellular energy.
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Polar molecules and ions the membrane's hydrophobic core would otherwise block instead pass through with a transport protein's help.
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Facilitated transport stays passive — the gradient supplies the movement, and the protein only removes the membrane's obstacle.