1. Answer at the top of your guided notes for today
Can you drink too much water? Can you drink so much water that it kills you? Explain your answer.

2. Yes!
SACRAMENTO, Calif.  Jennifer Strange, 28, was found dead in her home due to water intoxication hours after taking part in the “Hold Your Wee for a Wii” radio contest which promised a Nintendo Wii video game system for the winner.

3. How do our bodies maintain that balance?
Drinking too much water is called water intoxication, or hyponatremia, which means that your blood is too diluted and does not contain enough salt. Without the right balance of salt and water, your brain cells swell and burst, leading to death.
How do our bodies maintain that
balance?

4. Cellular Transport Part 1

5. How does cellular transport help us stay alive?
Essential question
How does cellular transport help us stay alive?

6. objectives By the end of this lesson I will be able to:
Understand how cellular transport contributes to homeostasis
Identify solute, solvent, and solution
Describe concentration
Predict what will happen to a cell in an isotonic solution, a hypertonic solution, and a hypotonic solution
Differentiate between passive and active transport

7. Dynamic equilibrium Continuous movement but no overall change
Think: I have 25 students in my class. Two leave, then three enter, then one more leaves. How many students am I left with?
The balance is maintained

8. Take out a sheet of paper. Put your name on it
Take out a sheet of paper. Put your name on it. Using complete sentences, write step by step how you make Kool-Aid. Must be completed silently! You have 5 minutes. When finished, come get a cup.

9. solutions
Solvent – the larger material {liquid} that dissolves the solute
Water is considered the “universal” solvent
Solute – smaller substance that is dissolved by the solvent.
Ex. salt & sugar
Solution – Complete mixture of solute and solvent
Ex. Sweet tea

10. Concentration Definition: The amount of solute in a given solution
For example, the more people in a classroom, the higher the concentration.
People=“solute”
Room=“solution”
Write your own example. Describe the meaning of concentration to a non-biology student.

11. Concentration review
In one cup, you put half a packet of Kool-Aid powder.
In the next cup, you put the whole packet in.
Which cup contains the more concentrated solution?

12. Quick Check!
Go back to your Kool-Aid recipe. Rewrite it correctly including the following vocabulary words: solute, solvent, solution, concentration, and dynamic equilibrium

13. Water moves from a high concentration to a low concentration
Why did that woman’s brain cells swell? **Write your thoughts down on your notes

14. Osmosis
Osmosis is the process of water moving from high to low concentration across a membrane.

15. The three types of solutions
The three types of solutions **The name describes the amount of solute outside of the cell

16. isotonic
When a cell is in a solution that has the same concentration of water and solutes
Solution has achieved dynamic equilibrium All solutions make changes to be isotonic

17. hypertonic
A cell is in a solution that has a higher concentration of solute outside of the cell
Hyper means higher {more concentrated}
Think: more salt outside the cell, therefore less water outside the cell
Where will the water move?

18. hypotonic
A cell is in a solution that has a lower concentration of solute outside of the cell
Hypo means lower {less concentrated}
Think: less salt outside the cell, therefore more water outside the cell
Where will the water move?

19. predict You put red blood cells into the following solutions: Isotonic
Hypotonic
Hypertonic
Predict what will happen in each of the solutions. Think: Where will the water move?

21. answers In an isotonic solution, the cell will stay the same size
In a hypertonic solution, there is more solute (and therefore less water) outside the cell. Water will move outside the cell and therefore shrink.
In a hypotonic solution, there is less solute (and therefore more water) outside the cell. Water will move inside the cell and therefore swell.

22. Back to the essential question
How does cellular transport help us stay alive?
Things “naturally” move from a high concentration to a low concentration. Why?

23. Passive Transport
Movement of materials in & out of the cell without {NO} Energy
Hypertonic
High Low
Concentration Concentration
(hypertonic) (hypotonic)
Hypotonic

24. Movement of materials in & out cell WITH energy
Active Transport
Movement of materials in & out cell WITH energy
High
Low
Low

25. Gummi bear mini-lab
Take out your gummi bear predictions
HW: rewrite what actually happened using the following: osmosis, hypotonic, hypertonic, isotonic, and concentration.
Be sure to say if osmosis is an example of passive or active transport.