1. Osmosis

2. EOC Review Coach’s Book: Page

3. Aquaporins The phospholipid bilayer of the cell membrane is partially hydophobic and hate water Because of this there are certain parts of the cell membrane that allow water to pass through Aquaporins – water channel proteins which allow water to flow through cell membrane

4. Osmosis These aquaporins keep up the process of osmosis Osmosis – the flow of water through a semipermeable membrane from an area of greater concentration to an area of lesser concentration

5. How does osmosis work? Osmosis is the movement of WATER, not anything else No sugar, No lipids, No carbohydrates – nothing So, if you have a membrane with different amounts of water on both sides which way does the water move? Where it’s greater to where it’s lesser

6. Osmosis View

7. Types of Solutions A solution can have a strength based on amount of water Isotonic – same amount of water on both sides of semipermeable membrane Hypotonic and Hypertonic have more water on one side than the other. You have to look at what’s in the water and how much The one with a higher sugar solution is on the right and therefore is hypotonic

8. More types of solutions The tube has less sugar concentration on the left hand side of the semipermeable membrane and is hypertonic

9. Osmotic Pressure Driven by the differences in solution concentration, the movement of water into or out of cell causes osmotic pressure In a hypertonic solution, the cell will shrink In a hypotonic solution, the cell will swell What would happen to a saltwater plant cell if you placed it in fresh water?

10. The cell will enlarge and possibly explode! Or at least do some damage!