2. Diffusion: What is the tendency of all molecules? What causes this tendency?

3. Diffusion continued… What is the general movement of molecules as they diffuse? What direction will they move in? What is this general direction of molecules called? Hint concentrations!!

4. Passive Transport What is passive transport? What causes this movement? Where will the molecules in the image travel if there are no molecules outside of the cell?

5. Once the number of molecules are balanced inside and outside of the cell, what will happen to the movement of molecules?

6. What does membrane permeability mean? What does a semi-permeable or selectively permeable membrane mean? What does facilitated diffusion do for the movement of cells across membranes?

7. Facilitated diffusion involves the use of a protein to transport molecules across the cell membrane. Facilitated diffusion is a type of ______________. What does facilitated diffusion use to help transport molecules across membranes? What are some molecules that are unable to pass through the lipis bilayer of cell membranes? (Name

8. What is the use of ion channel proteins? What id the use of carrier proteins? What protein opens or closes the membrane to control the passage of substances into the cell.

9. Carrier proteins bind to specific molecules, change shape and then deposit the molecules across the membrane. Once the transaction is complete the proteins return to their original position.

10. Osmosis is a special case of __________________. What is the movement between a hypotonic solution and a hypertonic solution. What determines the direction of water flow? If the blood cells in the image above are placed in salt water solutions of different concentrations, the following will occur:

11. What does a hypertonic salt solution mean? What direction will the water flow? What is a result of a blood cell in a salt solution? What will happen to its size?

12. What does isotonic mean? What direction is the movement of fluid? What is an example of a isotonic solution? What will happen to the size of the blood vessel?

13. What is a hypotonic solution? What is the concentration of salt ompared to the other membrane wall? What direction will the fluid move? What will happen to the size of the blood vessel? What is it called when a blood vessel bursts?

14. Reference http://biology.about.com/od/cellularprocesses/ss/diffusion.htm