1. Active Transport 1. A cell contains a solution that is 88% water, and it is sitting in a solution that is 20% water. 2. A cell contains a solution that is 43% sugar, and it is sitting in a solution that is 99% sugar. For each: 1. Identify the type of solution 2. Describe what will move, and where 3. Explain why this occurs 4. Describe how the cell’s volume will change For each: 1. Identify the type of solution 2. Describe what will move, and where 3. Explain why this occurs 4. Describe how the cell’s volume will change

2. Homework Review

3. #12.  Distilled water has a lower concentration of protein than does human blood. Imagine that Ms. SCHERBEN is in the hospital and she needs a blood transfusion. Unfortunately, the doctor messes up and gives Ms. SCHERBEN distilled water instead of blood! Lower protein HIGHER H2O LOWER H2O

4. HYPOTONICISOTONICHYPERTONIC “LYSIS”

6. Goal  By the end of the period, we can…  Compare active and passive transport  Identify whether cellular transport is diffusion, active transport, or osmosis

7. Passive Transport  Key Point #1: Passive transport takes no energy and always moves towards equilibrium.  The goal is equal concentration (equilibrium)  High  Low concentration  Happens naturally (no energy)  Diffusion AND osmosis

8. In DIFFUSION  The solutes are permeable to the membrane and move H  L.

9. In OSMOSIS  Only water (solvent) is permeable to the membrane. 75% water 20% water

10. Active Transport  Key Point #2: Active transport takes energy to move all solutes in or out of the cell.  The goal is to move against equilibrium  Low  High concentration  Happens on purpose (takes energy)  Question: What form of energy would the cell use for active transport?

11. In ACTIVE TRANSPORT  The solutes are permeable to the membrane and move L  H

12. Active Transport  Why would the cell do this?  To store food inside the cell  To eliminate wastes  To get rid of toxins

13. Comparing the Three DIFFUSION ACTIVE TRANSPORT PASSIVE TRANSPORT OSMOSIS SOLUTES WATER EQUILBRIUM NO ENERGY SOLUTESEQUILBRIUM ENERGY

14. Helpful Hints  How can you tell if something is active or passive?  How do you know if it diffusion or osmosis?  Ask yourself:  Is the solute moving, or is water moving?  What is permeable to the membrane?  Are we moving H  L or L  H?

15. Guided Practice  State whether this is Active Transport or Passive Transport

16. Active or Passive?

18.  Water moving to equalize concentrations

19. Active or Passive?  Cell uses ATP to get as much sugar as possible

20. Active or Passive?  Happens naturally with no use of energy

21. Active or Passive?  ALL solutes being moved out of the cell

22. Active or Passive?  Takes energy

23. Active or Passive?  Moving toward equilibrium

24. Changing Gears  Now I will give you two cells. I will tell you what is moving and where. You tell me if it is DIFFUSION, OSMOSIS, OR ACTIVE TRANSPORT.

25. If solutes are moving from L  R

27. If water is moving from R  L

28. Water is moving from inside  outside  A cell has a 40% sugar concentration inside is in a solution of 50% sugar concentration. The cell membrane is permeable to water.  HINT: IT MIGHT HELP YOU TO DRAW THE SITUATION

29. Solutes are moving from inside  outside  A cell has a 10% sugar concentration inside is in a solution of 50% sugar concentration. The cell membrane is permeable to solutes.

30. Solutes are moving from outside  inside  A cell has a 10% sugar concentration inside is in a solution of 80% sugar concentration. The cell membrane is permeable to solutes.

31. Solutes are moving from outside  inside  A cell has a 40% sugar concentration inside is in a solution of 20% sugar concentration. The cell membrane is permeable to solutes.

32. Independent Practice  Work INDIVIDUALLY to complete the worksheet.  Yeaaaaaaaaahhhhh!

33. Key Point Wrap-Up  Key Point #1: Passive transport takes no energy and always moves towards equilibrium.  Both diffusion and osmosis  Key Point #2: Active transport takes energy to move all solutes in or out of the cell.

34. Exit Question 1. Match each of the following statements to either ACTIVE or PASSIVE transport. (You do not have to write complete sentences!) (1) Requires energy (2) Movement of solute or solvent in/out of a cell (3) Moves toward equilibrium 2. A cell containing 20% sugar solution is placed in 80% sugar solution. What will happen if ACTIVE transport occurs?