1. Unit 3: What's wrong with Lilly DeLeiph?
Do Now:
We know that Lilly’s cells are not able to produce enough energy. Could it be possible that her cells are not receiving the materials they need to make energy!? We will start our case study by investigating this question.
First, we must brainstorm: What materials might Lilly’s cells need to survive and make energy?

2. Substances Cells Need:

3. Substances are transported across the cell membrane
Cell membrane is the barrier that separates the cell from the outside world, anything that needs to be transported in comes across the cell membrane. The cell membrane determines what can enter or exit and what cant

4. Types of Passive Transport
Diffusion: materials move from areas of HIGH concentration to areas of LOW concentration.
No energy is required!!

5. Diffusion Concentration inside the cell: ______
Concentration outside the cell: ______

6. Molecules must be the same type!
Diffusion

7. Molecules must be the same type!
Diffusion

8. Dye Demo Do you think the dye molecules are moving by diffusion?
Why or why not?

9. Types of Passive Transport
Osmosis: diffusion of water.
H2O moves from areas of HIGH concentration to areas of LOW concentration.
No energy is required!!

10. TYPES OF SOLUTIONS Cause Water to move
There are 3 types of solutions a cell can be exposed to.
Isotonic Hypertonic Hypotonic

11. Facilitated Diffusion:
Facilitated diffusion is diffusion through transport proteins.
Some molecules cannot easily diffuse across the cell membrane.

12. Types of Transportation
Active Transport: materials move from areas of LOW concentration to areas of HIGH concentration.
Requires Energy (ATP)!!

13. Concentration inside the cell: ______
Active Transport
Concentration inside the cell: ______
Concentration outside the cell: ______

14. Types of Active Transport
Sodium-Potassium (Na+/K-) Pump
occurs through transport protein pumps.
Cells use active transport to maintain homeostasis

15. Types of Active Transport
1. Endocytosis is the process of taking material into the cell.
2. Exocytosis is the process of expelling material from the cell.

16. Why Does Active Transport Require ATP (Energy)?
Transport proteins on the cell membrane use ATP to pump materials across the cell membrane!

17. What PROCESS is depicted here? Explain.
Transport
Protein

18. Partner Practice Which side has a higher concentration?
In which direction will the substance naturally move? (Draw an arrow in the diagram to indicate this)
What is this process called?___________________

19. 2. The diagram below shows two different kinds of substances, A and B, entering a cell.
ATP is most likely being used for
substance A to enter the cell
(2) substance B to enter the cell
(3) both substances to enter the cell
(4) neither substance to enter the cell

20. Today’s Findings FACT: all gasses enter cells by diffusion.
When there is a low concentration of a gas in the cell, the gas can “float” in by diffusion.
Based on this fact do you think Lilly’s cells are unable to transport oxygen? Why or why not?

21. Today’s Findings
Lilly’s cells should be receiving oxygen because it enters naturally by diffusion.

22. Substances Lilly’s cells might need:
Today’s Findings
Substances Lilly’s cells might need:
Oxygen
Water
Glucose
_____________