1. Cellular Transport Molecules moving across the cell membrane Cell Membrane is selectively permeable (lets some things in, some things out, but not everything)

2. 2 Main Types of Transport 1. Passive Transport “down hill” 2. Active Transport “up hill”

3. Passive Transport a. no energy requirement b. Caused by random movement of molecules c. Molecules move with the concentration gradient

4. Concentration Gradient difference in the concentration of a substance across a space

5. Examples of Passive Transport Diffusion molecules move from high concentration to low concentration

6. Equilibrium balance of molecules on both sides of membrane

7. Examples of Passive Transport Osmosis - diffusion of water Ion Channels- charged molecules moved across membrane by proteins

8. Examples of Passive Transport Facilitated Diffusion- molecules moved across membrane by carrier proteins

9. Active Transport a. Requires Energy (ATP) b. Molecules move from areas of low concentration to areas of high concentration c. Molecules move against the concentration gradient

10. Examples of Active Transport Carrier Protein Pumps Movement of molecules by vesicles

11. Carrier Protein Pumps- pump ions across membrane Sodium/Potassium Pump - Ion exchange - Na + moved out / K + moved in - K + moved out / Na + moved in

12. Movement by vesicles Vesicles form Move molecules across the membrane

13. Movement by vesicles Endocytosis - into a cell

14. Movement by vesicles Exocytosis – out of a cell

15. Passive vs. Active Transport