1. Movement through Membranes
Cell Processes
Movement through Membranes

2. Passive Transport No energy necessary 3 types Diffusion
Facilitated Diffusion
Osmosis

3. Diffusion
Diffusion- Movement of molecules from HIGH concentrations to LOW concentrations
Ex:
Aerosol spray
Water and food coloring

4. Facilitated Diffusion
Diffusion with the help of a membrane channel protein
Ex.
Everyone UP!

5. Osmosis Diffusion of water across a membrane
Only water moves across membranes, not other materials
If there are more salts/sugars, then there are fewer water molecules
3 types of solutions:
Hypertonic
Hypotonic
Isotonic

6. Hypertonic Solution Water moves OUT of a cell… cell shrivels up
= salt

7. Hypotonic Solution Water moves INTO a cell… cell swells up Hypotonic
= salt

8. Isotonic Solution Water moves EQUALLY (iso) into and out of a cell
No net movement
= water
= salt

9. Active Transport
Energy used to force molecules from LOW concentrations to HIGH concentrations
Protein Pumps
Endocytosis
Phagocytosis and Pinocytosis

10. Protein Pumps
A membrane protein that uses ATP to pump molecules from low to high
High
ADP P
ATP
Low

11. Endocytosis Exocytosis Taking in large materials using vesicles
Phagocytosis- taking in food particles
Pinocytosis- taking in liquid particles
Exocytosis
Expelling large materials using vesicles

12. Endocytosis/Exocytosis