1. The Cell Membrane

2. Phospholipid Bilayer
Out In

3. Repels water or water-like substances
Out
Hydrophobic zone
Repels water or water-like substances In

4. Attracted to water or water-like substances
Out In
Hydrophilic zones
Attracted to water or water-like substances

5. Substances tend to move down a concentration gradient
High concentration
Low concentration

6. Oxygen
Out In
Diffusion

7. Out In
Diffusion

8. Out In
Equal concentration on both sides and equal movement in and out = equilibrium

9. Out In Osmosis Lower solute concentration Higher water concentration
Protein channel In
Water
Higher solute concentration
Lower water concentration
Osmosis
An example of
facilitated diffusion

10. Out In

11. Out In

12. Out In

13. Out In
Equal concentration of solutes on both sides and equal movement in and out = equilibrium

14. Facilitated diffusion

15. Out In

16. Out In

17. Out In

18. Out In

19. Concentration of each solute is the same on both sides and equal movement in and out = equilibrium

20. Active Transport

21. ATP
ATP
= energy

23. Concentration of solute is NOT the same on both sides