1. Bell Ringer (5 mins)
Unit 4 Q#3 (Immune System)

2. Agenda Bell Ringer (5 minutes)
Introduction: Death by Water (10 minutes)
Notebook Input (10 minutes)
Notebook Output (5 minutes)
Stations (40 minutes)
Independent Practice (10 minutes)
Exit Quiz (10 minutes) 2

3. What are we learning?
Main Idea: Cell transport= how cells move things in and out
Cell membrane function
Cell membrane structure
Passive transport
Diffusion
Osmosis
Active transport

4. Intro: Death by Water 4

5. Turn-and-Talk What do you think caused Zyrees’s death?
How did drinking too much water cause him to become brain-dead? 5

6. Notebook Input Today you will be using a power notes worksheet
The words that go in the blanks will be underlined 6

7. What is the function of the cell membrane?
It is a barrier that controls what enters and leaves the cell. Also called plasma membrane.
Outside
of cell
Inside
(cytoplasm)
Cell
membrane
Proteins
Protein
channel
Lipid bilayer
Carbohydrate
chains

8. The cell membrane is made of phospholipids.
Phospholipid bilayer
The cell membrane is made of phospholipids.
The head is polar and hydrophilic.
Attracted to water
The two long tails are non- polar and hyrdophobic
Repel water
The double layer of phospholipids forms a flexible bi-layer 8

9. The lipid bilayer gives the cell membrane flexibility
Fluid Mosaic Model
The lipid bilayer gives the cell membrane flexibility
There are proteins that are embedded in the lipid bilayer. 9

10. Selective Permeability (Semi-permeability)
Selectively permeable means that only SOME things can pass through
Typically, small, non-polar molecules can pass through the phospholipid bilayer, while large, polar molecules cannot.
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11. There are three forms of passive transport: Diffusion Osmosis
Passive transport allows movement across the cell membrane without using ATP (energy)
There are three forms of passive transport:
Diffusion
Osmosis
Facilitated diffusion
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12. What is concentration?
Concentration is the amount of solute dissolved in a solution
Example: 50% alcohol, or 30g/mL salt
Water and molecules naturally move from HIGH to LOW concentrations
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13. Check For Understanding
Which one has a higher salt concentration?
What is the solute?
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14. Movement of water from high concentration to low concentration.
Diffusion
During diffusion, particles in a solution move from an area of high concentration to an area of low concentration.
Does not use energy.
Osmosis
During osmosis, water diffuses through a selectively permeable membrane.
Movement of water from high concentration to low concentration.
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17. Check For Understanding
The blue dots represent salt molecules
Where is the higher concentration, inside or outside?
Where will the water go?
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18. Causes water to rush out of the cell.
Isotonic solution: concentration of solutes inside and outside of cell are equal
Hypertonic solution: solution has higher concentration of solutes than cell.
Causes water to rush out of the cell.
Hypotonic solution: solution has lower concentration of solutes than cell.
Causes water to rush into the cell.
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20. Facilitated Diffusion
During facilitated diffusion, membrane proteins make it easy for certain molecules to cross the membrane.
High concentration to low concentration.
Does not use energy.
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21. Molecules move from low concentration to high concentration.
Active Transport
During active transport, cells move material against the concentration gradient.
Molecules move from low concentration to high concentration.
Carried out by transport proteins.
Requires ATP.
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22. Notebook Output 5 MIN.
Now that you know about cell transport, go back to the problem of Zyrees’s death by water.
Using what you learned, explained why drinking 4 gallons of water caused Zyrees’s death.
Use the following vocabulary words: concentration, passive transport, cell membrane, osmosis, hypotonic solution.
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23. Stations
With a partner to complete the stations and answer ALL questions
Work with URGENCY, only 2 minutes per station

24. Independent Practice
Work silently!
10 minutes!

25. Exit Quiz
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26. Home Learning
Review your notes and work from Unit 1 and Unit 2 in preparation for your Mid-Year evaluation!
Copy any notes or finish any necessary materials as instructed on classroom.google.com