Passive transport: movement along a concentration gradient, allowing no energy to be used
Diffusion: the movement of small non-polar molecules down their concentration gradient
Facilitated Diffusion: the use of transport proteins to transport large, polar molecules, or ions down their concentration gradient
Osmosis: diffusion of water molecules, which occurs with the assistance of membrane proteins called aquaporins
Osmosis is thus a facilitated diffusion.
Channel: an integral protein that has one pore for molecules to go through; functions like security metal scanners
Carrier: an integral protein that binds to the molecule and then releases it into the cell
