1. Cell Membrane!!

2. Cell Membranes are composed of 2 Layers of Phospholipids = Phospholipid Bilayer
Heads = love water
Tails = hate water
Middle = oily substance that keeps water out

3. Soap + Oil

5. The cell membrane is semi-permeable: allows substances to pass based on size
DEMO!

6. What enters and exits cells?
Carbon Dioxide
Water
Small molecules can pass through the phospholipid bilayer; but how do the big molecules get into cells?
Oxygen
Glucose
Enzymes

7. The Fluid Mosaic Model of The Cell Membrane
Fluid: moves easily
Mosaic: made of phospholipids, carbohydrates, protein channels

8. Cell Transport Jigsaw:
Each group will read about a different type of cell transport
You are to become an EXPERT in your topic.
While reading:
Pull out vocab words and define.
Take notes on important info.
Summarize the transport type.
You will then switch groups and become the teacher of that topic in your group.
You are fully responsible for the people in your group learning your section of notes.
Group 1: Diffusion
Group 2: Osmosis
Group 3: Facilitated Diffusion/Ion Channels
Group 4: Sodium Pumps
Group 5: Exo/Endocytosis
**B2 Only:
Group 5:Exocytosis
Group 6: Endocytosis

9. Cell Transport
Passive Transport
Active Transport

10. Terms given for the movement of molecules into and out of the cell:
Passive Transport: No Energy Required
Simple Diffusion
Osmosis
Facilitated Diffusion
Active Transport: Energy (ATP) Required
Cell Membrane Pumps
Endocytosis
Exocytosis

11. Passive Transport: Simple Diffusion
Movement of particles from HIGH CONCENTRATION  LOW CONCENTRATION until EQUILIBRIUM is reached. (what is equilibrium?)
Demos: Food Coloring and Perfume

12. What will happen?
= oxygen
The molecules continue to move from areas of high concentration to low concentration until EQUILIBRIUM is reached!

13. Simple Diffusion in Cells: Oxygen and Carbon Dioxide

14. Passive Transport: Facilitated Diffusion
Diffusion of molecules that are too large
Need the help of protein channels
Example: Glucose

15. Passive Transport: Osmosis
Movement of WATER from HIGH CONCENTRATION  LOW CONCENTRATION (through a protein channel) until EQUILIBRIUM is reached * osmosis = facilitated diffusion of water because of oily center of cell membrane

16. Why does the water move, not the molecules in osmosis?
What will happen?
= water
= solute
Why does the water move, not the molecules in osmosis?
Higher concentration of solute inside the cell than outside the cell
Equal concentration of solute inside and outside the cell
Lower concentration of solute inside the cell than outside the cell

17. Switching from Passive Transport to Active Transport
Switching from Passive Transport to Active Transport. What do you think the difference will be?

18. Active Transport: Cell Membrane Pumps
The movement of particles from low to high concentration with the help of a protein pump. Requires Energy (ATP)!

19. Active Transport: Exocytosis
EXO = OUT!
How cells release materials (proteins, wastes, toxins)

20. Active Transport: Endocytosis
ENDO = IN!
How large molecules enter the cell