1. Brownian motion Diffusion Osmosis
A & P 231
Brownian motion
Diffusion
Osmosis

2. Selectively Permeable Membranes
Movement of particles through membranes
Not all molecules pass through (selectively!)
Dependent on size of molecules
Dependent on charge of molecules

3. Two ways to pass through a membrane
Passive Processes
1) Diffusion- movement of molecules from high to low concentration driven by kinetic energy (constant movement of Molecules Kickball ex.)
2)Osmosis-diffusion of water only
3) Facilitated diffusion-uses protein gates
Active Processes
1) Active Transport- movement of molecules from an area of low concentration to high concentration *uses Energy in the form of ATP

4. Diffusion

5. Two ways to pass through a membrane
Passive Processes
1) Diffusion- movement of molecules from high to low concentration
2)Osmosis-diffusion of water only
3) Facilitated diffusion-uses protein gates
Active Processes
1) Active Transport- movement of molecules from an area of low concentration to high concentration *uses Energy in the form of ATP

6. Osmosis
90% water
10% water

7. Two ways to pass through a membrane
Passive Processes
1) Diffusion- movement of molecules from high to low concentration
2)Osmosis-diffusion of water only
3) Facilitated diffusion-uses protein gates
Active Processes
1) Active Transport- movement of molecules from an area of low concentration to high concentration *uses Energy in the form of ATP

8. Facilitated Diffusion

9. Two ways to pass through a membrane
Passive Processes
1) Diffusion- movement of molecules from high to low concentration
2)Osmosis-diffusion of water only
3) Facilitated diffusion-uses protein gates
Active Processes
1) Active Transport- movement of molecules from an area of low concentration to high concentration *uses Energy in the form of ATP

10. Active Transport
Uses Energy (ATP)!

11. Brownian Motion

12. Dialysis tubing (Handout)
A semi-permeable membrane
Artificial way of cleaning the blood

13. Sheep Cells (pg 45)
Place one drop of 0.9% saline solution and one drop of sheep’s blood
Repeat with 1.5%
Repeat with 0%

14. 0.9% (physiological saline solution) Isotonic-no movement
No Net Movement
.9 salt
99.1 water
.9 salt
99.1 water

15. 1.5% saline solution Hypertonic-a lot in solution
Wrinkling of cell because water moves out called crenation
Diffusion
1.5 salt
98.5 water
.9 salt
99.1 water
Osmosis

16. 0% (saline solution) Hypotonic-a little in solution
Cell lysis occurs or swelling of cells at least
0 salt
100 water
.9 salt
99.1 water
Osmosis