1. Movement in and out of cells

2. Learning Objectives Define diffusion as
the net movement of molecules
from a region of their higher concentration to a region of their lower concentration
down a concentration gradient,
as a result of their random movement
Describe the importance of diffusion of gases and solutes and of water as a solvent

3. Getting in and out of cells
How does this work? ?

4. So how does this happen?
In 2 ways
Diffusion
Active Transport 4

5. They both move molecules
Active transport works ACTIVELY
Diffusion just happens 5

6. 6

7. 7

8. How can this be helped? A diffusion gradient
This means lots on one side and little on the other

9. How can this be helped? A large surface area
For the stuff to diffuse/active transport through

10. Large surface area 10