1. Start-up for October 27, 2014 As you watch the following video:
Identify at least three parts of the cell you believe are shown.
Explain why you believe the cell part you picked is shown.
Cell Video

2. Objective: Students will A) Identify the 3 parts and functions of the cell membrane
B) Define cellular transport and concentration C) Compare osmosis and diffusion D) Compare passive and active transport
E) Predict cell response from changing salt concentrations

3. Movement through the membrane Ch. 7 Section 3, Pages 184-189
Cellular Transport
Movement through the membrane
Ch. 7 Section 3, Pages

4. Cell Membrane Surrounds cells Gives shape to animal cells
A) Identify the 3 parts and functions of the cell membrane
Cell Membrane
Surrounds cells
Gives shape to animal cells
Inside cell wall of plant cells

5. Cell Membrane Made of: Lipid bilayer – 2 fat layers Protein channels
A) Identify the 3 parts and functions of the cell membrane
Cell Membrane
Made of:
Lipid bilayer – 2 fat layers
Protein channels
Carbohydrate Chains
Semi-permeable

6. Semi-permeable or Selectively Permeable
A) Identify the 3 parts and functions of the cell membrane
Semi-permeable or Selectively Permeable
Semi= “some” substances may pass
Selective
Based upon size & solubility
H20 flows
Salt remains

7. Cell Membrane Hydrophillic and Polar inside – attracts water
A) Identify the 3 parts and functions of the cell membrane
Cell Membrane
Hydrophobic and Non-polar Outside – repels water
Does the cell like to lose or keep water? Keep so scared to lose it.
If you are scared of spiders, what are you called? Inside is phobic.
Hydrophillic and Polar inside – attracts water
Hydrophobic and Non-polar Outside – repels water

8. Cellular Transport Substances moved? How moved?
B) Define cellular transport and concentration
Cellular Transport
Substances moved?
How moved?
What is passive and active transport?
When referring to transport we are talking about what substances are moved? How are they moved?

9. Solution Concentration:
B) Define cellular transport and concentration
Solution Concentration:
Like density = # molecules per volume of container
Low or High Concentration?
* * * * *
* * * * * * * * * * * * * * *
High Conc.
* *
Low Conc.

10. Diffusion Movement of molecules: gas or liquid
C) Compare osmosis and diffusion
Diffusion
Movement of molecules: gas or liquid
Law of Diffusion: From High Concentration to Low Concentration
Balance the crowding

11. Diffusion of gases……. CO2 High, O2 Low Blood from lungs = O2 High,
B) Compare osmosis and diffusion
Diffusion of gases…….
Blood from lungs =
O2 High,
CO2 Low
CO2 O2
CO2 High, O2 Low

12. Osmosis Movement of water Special case of diffusion Think H2Osmosis
C) Compare osmosis and diffusion
Osmosis
Movement of water
Special case of diffusion
Think H2Osmosis

13. Equilibrium H2O H2O H2O Osmosis balanced Isotonic Solution
C) Compare osmosis and diffusion
Equilibrium
H2O H2O H2O
“Equi” = Equal concentrations on both sides of membrane
Osmosis balanced
Isotonic Solution
Iso means equal

14. In Osmosis….only H2O moves
C) Compare osmosis and diffusion
In Osmosis….only H2O moves
Therefore focus on the water concentration. Predict the water movement given the following:
10% salt solution
-H20
+NaCl
1% salt
solution + H20
-NaCl
H20
H20
What will happen to the water in this situation?
Water flows from High to Low Concentration

15. Concentration Gradient
D) Compare passive and active transport
Concentration Gradient
* *
* * * *

16. Start Up 10/28/14 What is diffusion?
What is the difference between diffusion and osmosis?

17. Passive Transport Diffusion or Osmosis Going with the gradient
D) Compare passive and active transport
Passive Transport
Diffusion or Osmosis
Going with the gradient
No ATP energy required
High Conc. To Low Conc.
* * * * * * * * * *

18. Active Transport Against the gradient Requires ATP
D) Compare passive and active transport
Active Transport
Against the gradient
Requires ATP
Low to High Concentrations
Salt returning to blood in kidneys
* * * * * * * * * * *

19. Understanding Check Active or Passive Transport?
Which requires ATP energy?
Which goes with the concentration gradient?
Which goes against the gradient?
Active
Passive
Active

20. Outside the cell Hypotonic or Hypertonic Solutions?
E) Predict cell response from changing salt concentrations.
Outside the cell Hypotonic or Hypertonic Solutions?
Tap
Water
Hypotonic = “under” or low salt outside, relative to cell
Hypertonic = “over” or high salt relative to cell
Salt water
inside cell

21. Plasmolysis Cell membranes shrink or expand
E) Predict cell response from changing salt concentrations.
Plasmolysis
Cell membranes shrink or expand
Dependent on salt concentrations

22. Sea water organism in fresh water……………….
Tap
Water
Hypotonic Solution =
Low salt concentration outside the cell
High Water concentration outside
Water moves?
Inside
Cell Bursts!
Salt Water
Inside Cell
Low Water
H20

23. Fresh water organism in salt water………….
Hypertonic Solution
Water moves?
Out of the cell
Cell shrinks
Salt Water
High salt
Low water
Fresh water
Inside cell=
High Water
H20

24. Plants cells bulge, not burst!
Or Cell Membranes Shrink

25. Understanding Check
1. Draw a basic cell membrane and label the three main parts.
2. Why is the cell membrane called semipermeable?
3. Predict what will happen to a plant cell that is placed in salt water. Why does this happen?