Facilitated Transport
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Facilitated transport moves a substance down its existing concentration gradient with the help of a membrane protein, using no cellular energy.
Show
Polar molecules and ions the membrane's hydrophobic core would otherwise block instead pass through with a transport protein's help.
Watch for
Facilitated transport stays passive — the gradient supplies the movement, and the protein only removes the membrane's obstacle.