1. DO NOW 1.Get out your buffer lab 2.Which substance’s pH changed the most when acid was added? What about when base was added? 3.Why did the pH changes occur?

2. Homeostasis The ability of an organism to adjust its internal environment to keep it stable.

3. Where are WE? Organism Tissue Cell Transport is fueled by the need of the cell to maintain homeostasis

4. Diffusion Movement of particles from a high concentration to a low concentration; reach homeostasis HighLow

5. What is concentration? The amount of a substance High concentration means there is a lot present

6. External examples of diffusion a. Food coloring and water

8. High concentration (amount of substance) Low concentration

9. External examples of diffusion b. Lotions/Perfume/Unpleasant odors in a closed room

10. Substances that can diffuse across the cell membrane

11. Certain substances can diffuse straight across the phospholipid bilayer Phospholipid bilayer

12. Examples of Diffusion a. Oxygen and Carbon dioxide exchange in the blood

14. Osmosis: Introductory Terms Solution: A mixture of two or more substances; both are completely dissolved

15. Osmosis: Introductory Terms Solvent: The dissolver; usually a liquid

16. Osmosis: Introductory Terms Solute: Disolvee; what is being dissolved

17. Osmosis Movement of WATER from a high to a low concentration

18. Hint: a. Water will ALWAYS move to the higher concentration of dissolved substances.

19. Hint: b. Solute SUCKS solvent (water)!!!! Solute Water

20. Isotonic Solution Cell remains same size Water moves in and out at same rate (time) The concentration of dissolved substances is equal in and out of cell.

21. *RBC Video *Elodea Video

22. Hypotonic Solution Cell swells Water moves in The higher concentration of dissolved substances is __________ the cell.

23. *RBC Video *Celery Video

24. Hypertonic Solution Cell shrinks Water moves out The higher concentration of dissolved substances is __________ the cell.

25. *RBC Video *Elodea Video *Onion Video

27. Do Now 1.Explain what is happening in the picture below. HINT: the white circles represent water; black circles are sugar. 2.How can you recognize a hypotonic environment?