1. Movement across the Plasma Membrane

2. Passive Transport
Movement of molecules across a semi-permeable membrane with a concentration gradient
no energy required
2 types
Diffusion
Facilitated Diffusion

3. Diffusion- net movement of molecules across a semi-permeable membrane

4. Diffusion
Solute molecules moving from an area of high concentration to an area of low concentration
(water)
Equilibrium is reached when there is an even distribution of solute molecules

5. Facilitated Diffusion
Movement of molecules across a semi-permeable membrane with a protein

6. Osmosis Diffusion of water through a semi-permeable membrane
Moves from High [water] to low [water]

7. Osmosis in Living Cells
3 Types
Isotonic
Hypertonic
Hypotonic

8. Effect of Water on RBC

9. Electron Micrograph of Osmosis in Red Blood Cells
Isotonic
Hypotonic
Hypertonic
Electron Micrograph of Osmosis in Red Blood Cells

10. Osmosis in Plant Cells
Hypertonic
Hypotonic

11. Active Transport
Movement of molecules across a semi-permeable membrane against a concentration gradient with a protein
Requires
Energy (ATP)

12. Lets Review:

13. Does it move with or against the concentration gradient?
What is….
Diffusion?
Does it move with or against the concentration gradient?
Facilitated Diffusion?
What does it require that is different than regular diffusion?