1. First Five
Silently in your notebooks, draw a low powered and high powered image using your drawing guidelines.

2. Announcements Due Today Make sure you are turning in all past homework
Magnification
Cell Drawing Homework
Make sure you are turning in all past homework

3. Finishing Lab Remaining Groups should do Microscope Lab
Everyone else work on Interactive Notebook, Missing work and Homework due Today

4. First Five
Which cell structure controls movements in and out of cells?
Distinguish the difference between cell membrane and cell wall?
What do you think the term osmosis means? The term diffusion?

5. Some additional notes
Tissue: a group of cells with similar structures, working together to perform a shared function
Organ: a structure made up of a group of tissues, working together to perform specific functions
Organ system: a group of organs with related functions, working together to perform body functions

6. Passing the membrane…
Movement in and out of cells

7. Think and Share
Take a few minutes and write in your notebook what you think the difference is between osmosis and diffusion.

8. Food Dye Experiment
Predict what would occur when food dye is dropped into a beaker filled with water.
Do you think this would be osmosis or diffusion

9. Molecules move from area of HIGH to LOW concentration
DIFFUSION
Requires NO energy
Molecules move from area of HIGH to LOW concentration
Molecules move down their concentration gradient

10. What about food dye? DIFFUSION
What happens to food dye that you drop into one spot in a cup of water?
DIFFUSION
MOLECULES OF FOOD COLORING ARE MOVING FROM HIGH CONCENTRATION TO LOW CONCENTRATION TO SPREAD OUT EVENLY IN THE WATER

11. Diffusion Driven by (powered by) the concentration gradient
NO energy used
Energy for diffusion comes from the kinetic energy of random movement of molecules and ions
Concentration gradient: the difference in the concentration of a substance from one location to another

12. A lot of Very little
Particles particles
High concentration low concentration

13. OSMOSIS: specific type of diffusion
The diffusion of water molecules across a partially permeable membrane
Moves from an area of high concentration of water to areas of low concentration of water
What is another way to say “high concentration of water”?

15. Osmosis: more terms Water diffuses down its gradient
Higher concentration of WATER=
Dilute solution=
High water potential
Lower concentration of WATER=
Concentrated solution=
Low water potential
Water diffuses down its gradient
moves from a region of high water potential to a region of low water potential

17. WATER CHASES MOLECULES!
WATER WANTS TO DILUTE SOLUTIONS SO IT WILL ALWAYS MOVE FROM A PLACE WHERE THERE ARE LESS MOLECULES TO A PLACE WHERE THERE ARE MORE MOLECULES!

18. CFU:
Which way will the molecules move by diffusion?

19. CFU: Does moving the molecules in this direction require energy?

20. CFU: If these were salt molecules moving, would this be diffusion or osmosis?

21. CFU: If these were water molecules moving, would this be diffusion or osmosis?

22. Osmosis in Cells
Recall that cytoplasm is a solution of protein and substances in water
Cells are usually also surrounded by fluids
When the solutions are different concentrations osmosis occurs

23. Animals Cells
Hypertonic: water leaves the cell to enter the more concentrated solution
Isotonic: Water enters and leaves at the same rate
Hypotonic: water enters the cells since the cytoplasm is more concentrated

24. Plant Cells
As osmosis occurs in plants cell, both the cytoplasm and the vacuole will lose or gain water.

25. What was the specialized cell of a plant that absorbed water and minerals?

27. Exit Ticket
Explain how diffusion works (use high and low gradient concentrations)
Explain how osmosis works
State the differences between diffusion and osmosis
Osmosis Rap

28. Animal Uptake

29. Active Transport