1. Cell Transport
EQ: How do the 3 types of transport work together to maintain homeostasis?

2. Two Types of Transport:
Substances are transported into and out of cells across the cell membrane in order to maintain HOMEOSTASIS
Two Types of Transport:
Active Passive
Ask the kids what the word transport means. (To move from one place to another). Cells need to move substances in and out in order to function. 2

3. Slide about selective permeable

4. What is Passive Transport?
1. Requires no energy from cell.
2. Molecules move from
high concentration to
low concentration.
3. Molecules move with the
concentration gradient.
These are the three characteristics of passive transport.
Concentration gradient – molecules flow with the movement of molecules. “Goes with the flow” – the different concentrations within a space. 4

5. Solution
Made up of Solute % (salt, sugar, minerals) Solvent %(Water) +
100 %

6. 3 Types of Passive Transport
Diffusion
Osmosis
Facilitated Diffusion

7. 1. DIFFUSION: when solutes move from high to low concentrations in order to reach equilibrium
Have students explain what is happening in the animation. Starts out highly concentrated and moves (diffuses) to achieve equilibrium. You can use the analogy of having all 30 students sitting at one desk. They would all move to even themselves out. 7

8. Diffusion through a cell membrane
Tell the kids to watch the molecules moving across the membrane. Ask why they are moving. – to reach equilibrium. Notice that some molecules are disappearing (they are being used.) 8

9. 2. OSMOSIS: when water moves from high to low concentration in order to reach equilibrium (a type of diffusion)
Ask what the “Mickey Mouse” molecules represent. - water (They should know this from previous powerpoints). Have the students explain to what is happening. Include movement from high to low.
Cell Membrane 9

10. But wait!!!!! Can you foresee a problem with water molecules passing through the lipid membrane?
Tell the kids to watch the molecules moving across the membrane. Ask why they are moving. – to reach equilibrium. Notice that some molecules are disappearing (they are being used.) 10

11. Water molecules pass through special proteins called AQUAPORINS
Water molecules pass through special proteins called AQUAPORINS. They allow water molecules to pass through the membrane without coming in contact with the lipid’s hydrophobic tails.

12. Large molecules (glucose) aren’t able to fit through the lipid bilayer
Large molecules (glucose) aren’t able to fit through the lipid bilayer. How will they get across??
I’m a Channel, I can help!
Facilitated Diffusion – channel proteins allows substances into the cell. Remember, the cell does not use energy during passive transport. 12

13. 3. FACILITATED DIFFUSION: movement of large solutes from a high concentration to a low concentration through CHANNEL PROTEINS
Facilitated Diffusion – channel proteins allows substances into the cell. Remember, the cell does not use energy during passive transport. 13

14. Explain what is happening
This shows the movement of all different substances, which is “reality.” They do not “take turns.” Get the students to explain what is happening. 14

15. CLOCK BUDDY TIME!!!!
With your 8:00 clock buddy, discuss the difference between the 3 types of passive transport:
1. diffusion
2. osmosis
3. facilitated diffusion 15

16. What is the movement of water called?
Word from unit
Picture
Have students draw a window pane on their notebook paper. If you are using an Interactive notebook this will go on the right side of the page. They will choose 6 words that have been discussed through passive transport and put one word in each square. Next, they will draw a picture under each word that represents the meaning of the word. 16

17. How is Active Transport different?
Active transport requires energy.
Solutes move from low concentration to high concentration
Molecules move against concentration gradient.
Ask the students what the energy is - ATP 17

18. Cell Pumps: Active Transport
The sodium-potassium pump is a classic example of a cell using active transport to move substances against the concentration gradient.
It is vital in proper functioning of nerve cells.
Click on the diagram to see an animation of a potassium-sodium pump at work. On the website, scroll down to see the animation. It can be slowed down or stopped at will. 18

19. Trap Food Form Food Vacuole Lysosomes Come To Vacuole
Amoeba
Form
Food
Vacuole
Lysosomes
Come To
Vacuole
Digestion
Your white bloods cells also do this.
This is the ingestion of large particles using energy.
Is it active or passive transport? 19

20. Amoeba engulfing a protist.
White blood cells engulf bacteria and viruses in the same way.
Is this active or passive transport? 20

21. What would happen to the animal cells?
100% Distilled Water
80% H2O
70% Water 30% Solute
80% H2O
80% Water 20% Solute
80% H2O
Ask the students to predict what would happen to the cells in the beaker. You may want to explain solutions first. Dissolved substances would be sugars, salts, ions, etc. 21

22. Which way did the water move? Why did the cell get so big?
100% Distilled Water
80% H2O
Have the students predict – and then show the answer. You have to click to get the beaker and the question to show.
Why did the cell get so big? 22

23. Which way did the water move?
80% Water 20% Dissolved Substances
80% H2O
Predict and show answer.
Why did the cell stay the same size? 23

24. Which way did the water move?
70% Water 30% Dissolved Substances
80% H2O
Predict and show answer.
Why did the cell get so small? 24

25. Which way did the solutes move?
70% Water 30% Dissolved Substances
80% H2O
20% solutes
Predict and show answer.
Why did the cell get so small? 25

26. Which way would the solute be moving if this were active transport?
90% Water
10% Solute
80% H2O
20% solute
Have the students predict – and then show the answer. You have to click to get the beaker and the question to show.
Why would it move that direction? 26

27. EQ: What’s the difference between a hypertonic and hypotonic solution?
Naming solutions
EQ: What’s the difference between a hypertonic and hypotonic solution?
This is going to show how cells transport substances in and out. 27

28. Hypertonic Solution
Greater amount of solutes in the solution compared to the cell.
70% Water 30% Solutes
20% solute
80% water 28

29. Hypotonic Solution
Fewer amount of solutes in the solution as compared to the cell.
100% Water
0% solutes
20% solutes
80% water 29

30. Isotonic Solution Same amount of solutes inside and outside the cell.
80% Water 20% Solutes
80% H2O
20% solutes 30

31. What type of solution was the saltwater solution?
Remember the potatoes?
What type of solution was the saltwater solution?
The water?
This is going to show how cells transport substances in and out. 31