The Cell Membrane & Transport

Here's a fun little game that will help you review the different parts of the cell membrane and also examine the role these parts play in transporting various molecules
http://www.quickflashgames.com/games/cell-defense-the-plasma-membrane/

Here is a nice little slideshow that does a great job explaining transport across cell membranes.  The section on active transport goes into a bit too much detail so don't sweat it if the concepts start seeming really unfamiliar!
http://www.wiley.com/college/boyer/0470003790/animations/membrane_transport/membrane_transport.htm