2. Cell Transport How molecules move in and out of a cell

3. Passive & Active Transport Passive Transport – requires no energy Moves molecules from high to low concentration Active Transport – requires energy Moves molecules from low to high concentration

4. Passive Transport http://programs.northlandcollege.edu/biology /biology1111/animations/passive1.swf http://programs.northlandcollege.edu/biology /biology1111/animations/passive1.swf

5. Passive Transport - 3 types 1.Simple Diffusion – molecules going from high to low concentration across a membrane 2.Facilitated Diffusion – molecules going from high to low concentration through a protein 3. Osmosis – diffusion of water

6. Active Transport http://www.yellowtang.org/animations/endocyt osis_exocytosis.swf

7. Passive Vs. Active Transport Active Transport – Requires Energy – Go from Low to High Concentration – Use Proteins Passive Transport – No Energy – Go from High to Low Concentration – May or may not use proteins

8. Passive vs. Active Transport

9. Water water everywhere, but not a drop to drink!

10. The effects of osmosis on cells HypotonicIsotonicHypertonic Different solutions have different impacts on cells…

11. Hypertonic, Hypotonic, Isotonic Water always tries to balance itself out..so…. Hyper – high (more)Hypo – low (less) 1.Hypertonic – more water inside the cell Result – water flows out of cell 2. Hypotonic - less water inside the cell Result – water flows into the cell 3.Isotonic – equal water inside/outside the cell Result – water levels stay the same

12. Hypertonic, Hypotonic, Isotonic? What is it? What direction will the water move? What will happen to the cell size? Salt water

13. Hypertonic, Hypotonic, Isotonic? What is it? What direction will the water move? What will happen to the cell size? Pure water Salt water

14. Hypertonic, Hypotonic, Isotonic? What is it? What direction will the water move? What will happen to the cell size? Pure water

15. Think about this……. You have two identical pitchers side by side – one filled with exactly 2 quarts of water – the other filled with 2 quarts of Kool-aid Which has more water in it? WHY???