Cell Transport
Passive
Active
Uses ATP adenosine triphosphate (energy)
Doesn't use energy
Simple diffusion
small and nonpolar molecules
goes WITH the concentration gradient
goes AGAINST the concentration gradient
from high concentration to low concentration
move through the phospholipid bilayer
from low to high
Facilitate Diffussion
large and polar molecules
uses transport integral proteins
uses channel proteins
Osmosis
movement of water molecules through a membrane
aquaporin (channel protein)
cytosine (engulfing membrane)
HUGE molecules
ribosomes: sythtise proteins