2. Passive Transport Concentration Gradient: the difference in the number of molecules in one area than in another area Requires no energy Goes from an area of high to an area of low Osmosis Diffusion Facilitated Diffusion

3. Osmosis Animation: How Osmosis Works The movement of water from an area of high concentration to an area of low concentration

4. Diffusion The movement of molecules from an area of high to an area of low Animation: How Diffusion Works

5. Tonicity

6. Facilitated Diffusion http://highered.mcgraw- hill.com/sites/0072495855/student_view0/chapter2/a nimation__how_diffusion_works.html http://highered.mcgraw- hill.com/sites/0072495855/student_view0/chapter2/a nimation__how_diffusion_works.html

7. Active Transport Requires energy Molecules go from an area of low to high Endocytosis vs. Exocytosis Types of endoctytosis 1. phagocytosis 2. pinocytosis 3. receptor mediated endocytosis

8. Endocytosis and Exocytosis http://highered.mcgraw- hill.com/olc/dl/120068/bio02.swf http://highered.mcgraw- hill.com/olc/dl/120068/bio02.swf