Macmillan Education
W.h. Freeman Publishing: Active Transport
Moving materials across the cell membrane sometimes requires energy, called active transport. This tutorial covers both primary and secondary active transport with good clear animations.
Sophia Learning
Sophia: Facilitated Diffusion: Lesson 5
This lesson explains the process of facilitated diffusion, explaining that it is a passive form of transport which uses protein channels to move larger molecules down their concentration gradient. It is 5 of 9 in the series titled...
Sophia Learning
Sophia: Facilitated Diffusion: Lesson 1
This lesson explains the process of facilitated diffusion, explaining that it is a passive form of transport which uses protein channels to move larger molecules down their concentration gradient. It is 1 of 9 in the series titled...