1. Cellular Transport Section 7.3 How cells move or transport the stuff they want into the cell & get the stuff they don’t want out! Page 208 – “Think About It”

2. 2 Types of Transport Passive Transport –We will talk about this type of transport first! no –Requires no energy. –3 Types: diffusion, osmosis, & facilitated diffusion Active Transport –Requires Energy –3 Types: Pumps, Endocytosis, Exocytosis

3. Diffusion Definition: movement of molecules from an area of high concentration to low concentration What is concentration? Concentration is an amount. Example: What does it mean if a pool has a high concentration of chlorine?

4. Diffusion Why? –molecules in constant motion, collide, & spread –More molecules, higher probability to collide When all molecules are equally spread apart this is called Equilibrium

5. Membrane Function Serves as a selective barrier meaning the membrane “selects” what it will allow to enter or exit the cell  semi-permeable membrane!semi-permeable membrane The Cell Membrane regulates what enters & exits the cell! Maintains Homeostasis!

6. How would the glucose move? 1M glucose 0.1M glucose 0.55M glucose 0.55M glucose

7. Types of Diffusion Special Case  Osmosis Definition = diffusion of water

8. Concentration Gradient Definition = a difference in concentration across an area High  Low = –down the gradient Low  High = –up the gradient

9. How does osmosis apply to cells? Q: What would happen if we put a cell in pure water?

10. What would happen if we put a cell in salt water? Shrink

11. Osmosis in Living Cells Cellulose in cell wall

12. Label the solutions below.