1. Cell Membrane
The cell membrane consists of a double layer of phospholipids.
Attracts Water
Layer 1
Repels Water
Layer 2

2. Cell Membrane
The cell membrane controls/ regulates what enters and leaves the cell.
This allows the cell to maintain homeostasis.
Homeostasis is the process of maintaing a constant/stable internal environment.

3. Cell Membrane
The cell membrane is selectively permeable. It “selects” which substances to allow in and out of a cell.
The cell membrane is permeable to substances that are able to cross the membrane.
Impermeable means substances are unable to cross the cell membrane.
Impermeable
Permeable

4. Cell Transport (Movement Through the Cell Membrane)
Every cell has liquid on the inside and liquid on the outside.

5. Cell Transport Yeah! What is cytoplasm?
One of the most important functions of the cell membrane is to regulate the movement of molecules from one side of the membrane to the other.
The molecules move through a solution which is the cytoplasm of the cell.
Yeah!
What is cytoplasm?
Cytoplasm is the material inside a cell that contains the cell organelles

6. Cytoplasm is a solution ??????
A liquid mixture of two or more substances
in which the molecules of the substance are
EVENLY mixed
What is a solution?
Gets dissolved in a solution
What is a solute?
Does the dissolving in the solution
What is a solvent?

7. Find A Friend and Think Solutions
Think of 4 different solutions. Identify the solute and solvent in your solutions. Write down and turn in!

8. Types of Cellular Transport
Passive Transport
cell doesn’t use energy
Diffusion
Facilitated Diffusion
Osmosis
Active Transport
cell does use energy
Endocytosis
Exocytosis
high
low
Weeee!!!
high
low
This is gonna be hard work!! 8

9. Diffusion Across Cell Membrane

10. Passive Transport Diffusion
In a solution, molecules move constantly.
Molecules tend to move from an area of high concentration to an area of low concentration.
This process ( moving from high to low) is called diffusion.
Diffusion does not require energy.

11. Passive Transport Facilitated Diffusion
Does not require energy
Facilitated Diffusion: movement of certain molecules across the cell membrane with the assistance of a protein channel.
Protein Channel

12. Passive Transport Osmosis
Osmosis: the diffusion of WATER across the cell membrane.
Water will move across the cell membrane until equilibrium is reached.
Three ways cells are effected by osmosis:
Hypotonic
Hypertonic
Isotonic

13. Osmosis Hypotonic Solution
Hypotonic: more water on the outside of the cell than the inside.
Water will diffuse from high to low causing water to enter the cell
This will cause the cell to swell and burst.
Cytolysis: the bursting of a cell
Normal Blood
Cell
Blood Cell in
Hypotonic Solution

14. Hypotonic Solution Video Blood Cells

15. Notebook Break 1) What “word” do you ALWAYS associate (think of) with
osmosis?
Water
2) In a hypotonic solution does a cell shrink or swell?
The cell will swell.
3) What causes the cell to shrink or swell?
The solution of water is greater on the outside of the cell
so water will enter the cell.
4) What is cytolysis?
The bursting of a cell

16. How can you remember that a hypotonic solution makes a cell get bigger?
Hypo = Hippo
A hippo drinks lots of water and can be very BIG.
Hypo/Hippo makes a cell get bigger!

17. Osmosis Hypertonic Solution
Hypertonic: more water on the inside of the cell than the outside of the cell.
Water will diffuse from high to low causing water to leave the cell
This will cause the cell to shrink.
Plasmolysis: the shrinking of a cell.
Normal Blood Cell
Blood Cell in
Hypertonic Solution

18. Hypertonic Solution Video Red Blood Cells

19. How can you remember that a hypertonic solution makes a cell get smaller?
Hyper = Hyper kid in class.
The teacher “kicks” the hyper kid out and the class size gets SMALLER (one less student)
Hyper/Hyper kid makes a cell get smaller!

20. Osmosis Isotonic Solution
Isotonic: same amount of water on both the outside and inside of a cell.
Water flows evenly across the cell membrane
Cell is its normal size

21. Isotonic Solution Video Red Blood Cells

22. How can you remember that a isotonic solution makes a cell stay in a state of equilibrium?
Iso = “ I so HAPPY!
The amount water both inside and outside the cell are the same. It’s equal on both sides!
This mean the cell is “happy!”

23. How well do you know your solutions in a cell?
Identify each illustration as hypotonic, hypertonic, or isotonic. 2. 3. 1. 4. 6. 5.

24. Active Transport Endocytosis Exocytosis Requires energy
Movement from an area of low to high concentration
Two types of Active Transport:
Endocytosis
Movement of material into the cell
En = In the cell
Exocytosis
Movement of material out of the cell
Ex = Exit the cell

25. Endocytosis Single celled organism engulfing food
Phagocytosis: a very large particle moving across the cell membrane

26. Exocytosis

27. Osmosis Activitiy Hypotonic Hypertonic Osmosis Isotonic
Create a Crossword Puzzle with terms from Cell Membrane Notes and Cell Transport Notes.
Minimum of 20
Hypertonic
Create a Multiple Choice Test for the Cell Membrane Notes and Cell Transport Notes.
Minimum of 20 and choices
A-D.
Osmosis
Create a Cell Membrane and Cell Transport lesson to present to the class. Include visuals and examples.
Be prepared to teach the class Monday 
Isotonic
Create a Fill In the Blank Story about the Cell Membrane and how substances are transported across the cell membrane.
Minimum of 20 and provide a word bank.