This is a 15 slide PowerPoint presentation on cells' exhanges with the environment. It covers topics such as diffusion, osmosis, passive transport, active transport, endocytosis, and exocytosis. There are suggestions for demos, discussions, several links to video clips or animations, as well as a couple slides of review. The topics are kept fairly simple, as this was intended to be presented to middle school students.
This presenation could take 1-2 days (45 min. class), depending on discussion.
I follow this presenation with a diffusion lab.