1. Passive and Active Transport

2. Types of Cellular Transport
Animations of Active Transport & Passive Transport
high
low
Weeee!!!
Passive Transport
cell doesn’t use energy
Diffusion
Facilitated Diffusion
Osmosis
Active Transport
cell does use energy
Protein Pumps
Endocytosis
Exocytosis
high
low
This is gonna be hard work!!

3. Biological Exchanges: Diffusion and Osmosis
Diffusion: net movement of molecules from an area of high concentration to an area of low concentration.
Example: Sugar or salt dissolving in water. Think Koolaide, instant coffee or tea, Crystal Lite

4. Molecules are always in motion
Difference between gas, liquid and solid

5. Diffusion
Molecules in solution tend to slowly spread apart over time. This is diffusion.

6. Diffusion [High] [Low] concentrated, high energy molecules
diffuse, low energy molecules

7. Concentration gradient

8. Diffusion in the Body Occurs across cell membranes
The cell membrane is differentially permeable (selective)
Movement of water across the membrane is called osmosis

9. Movement of Molecules Across the Cell Membrane
Oxygen and CO2
Water (Osmosis)
Ions (Electrolytes)
Sugar

10. Osmosis
Osmosis is the movement of WATER across a semi-permeable membrane
At first the concentration of solute is very high on the left.
But over time, the water moves across the semi-permeable membrane, and dilutes the particles.
Video

11. Animal Cells and Osmosis

12. Plant Cells and Osmosis
Vacuole fills

13. This requires math…
Osmosis Practice

14. Facilitated Diffusion
Molecules that are too large need a specific channel to pass through the membrane
High to low

15. Passive Transport
No energy
High to low
Ends in equilibrium

16. Active Transport Using ATP
Moving against the concentration gradient (moving uphill)
Low to high

17. Types of Active Transport
Sodium Potassium Pumps (Active Transport using proteins)
1. Protein Pumps -transport proteins that require energy to do work
Example: Sodium / Potassium Pumps are important in nerve responses.
Protein changes shape to move molecules: this requires energy!

18. Types of Active Transport
2. Endocytosis: taking bulky material into a cell
Uses energy
Cell membrane in-folds around food particle
“cell eating”
3. Exocytosis expelling bulky material out of a cell
“spitting out”
Vesicle fuses with membrane, contents exit

20. Act It Out
Your group of 4 will find a way to act out one of these types of active transport.
Make sure you are showing the main components of the transport that you choose.
Record your skit and it to me