1. Read the Background Info now…

2. Set up Gummy Bear Lab:
1. Write a prediction/hypothesis to answer the question written at the top of your lab sheet. 2. Fill out BEFORE soaking data in the table by measuring with a ruler 3. Determine MASS using an electronic balance…push ON and then TARE before putting gummy bear on balance. 4. Fill in “before” data in the 2nd and 3rd blank for the percent change math problems 5. Write initials on side of cup, place gummy bear inside and fill with water until it covers gummy bear 6. Place in back of room until tomorrow!

3. Cellular Transport Notes
Homeostasis, Passive Transport, Diffusion, Osmosis, & Active Transport

4. Learning Questions
How do cells maintain homeostasis in changing environments?
How do cells take in nutrients in order to grow and divide and to make needed materials?
How do you explain the relationship between the structures and functions of cell organelles?

5. Get Ready to take notes!

6. Objective of the Unit Explain that cells need to maintain homeostasis
Explain passive transport and diffusion
Define the process of osmosis
Explain the process of active transport and the role of ATP
Explain the processes of endocytosis and exocytosis

7. CELLS AND THEIR ENVIRONMENT:
HOMEOSTASIS

8. LIFE’S BALANCING ACT
If you are too hot or too cold your body temperature is out of balance

9. When we are too cold we shiver, it warms us up
When we are too hot we sweat, it cools us down.

10. Sweating and shivering are the body’s response to extreme temperature.
They help the body return to a temperature that is comfortable.
Sweating and shivering are the body’s response to extreme temperature.
The body is balanced

11. HOMEOSTASIS
The balance that all living things must maintain is called HOMEOSTASIS.

12. Importance of CELL BALANCE
Your body is made up of cells that must stay balanced. They need the right amount of materials to maintain the proper environment for your body.

13. Objective of the Unit Explain that cells need to maintain homeostasis
Explain passive transport and diffusion
Define the process of osmosis
Explain the process of active transport and the role of ATP
Explain the processes of endocytosis and exocytosis

14. Concentration Gradient:
The difference between the regions of high concentration and low concentration
The steeper the concentration gradient, the faster diffusion takes place
High concentration gradient
Fast rate of diffusion
Low concentration gradient
Slow rate of diffusion

15. “Selectively Permeable” Membranes
“Semi-Permeable” or
“Selectively Permeable” Membranes
A semi-permeable membrane will allow certain molecules to pass through it, but not others.
Partially permeable membrane
Generally, small particles can pass through…
…but large particles cannot

17. Cellular Transport!
The process by which molecules move from one side of the cell membrane to the other
Two Types Include:
Passive
Active

18. Passive Transport

19. Passive Transport Doesn’t require energy
Molecules move from high to low concentration Analogy: Like coasting down hill on a bike!

20. Diffusion
The passive movement of MOLECULES along a concentration gradient, or from regions of high to low concentration. EX: Spraying air freshener

21. Diffusion occurs because the particles in gases and liquids are moving.

22. Diffusion Particles in a liquid or gas spread out…
… from regions of high concentration…
… to regions of low concentration…
…until the particles are evenly spread out.

23. Osmosis- A type of diffusion
Osmosis is the DIFFUSION of WATER molecules…
… from a region of high concentration to low concentration …across a semi-permeable membrane…
…until they are evenly spread out.

24. Passive Transport Does osmosis or diffusion require energy?
No, molecules move along a concentration gradient
(high to low).

27. Free water molecules diffuse in this direction
Partially-permeable membrane
More free water molecules on this side of membrane
Water-solute particle is too large to pass through membrane
Free water molecules diffuse in this direction

30. TOD: Complete the definition
Osmosis is the movement of water
molecules from a region of high
concentration to low concentration
across a semi-permeable membrane.
answer

31. Brain Pop- Diffusion

32. Objective of the Unit Explain that cells need to maintain homeostasis
Explain passive transport and diffusion
Define the process of osmosis
Explain the process of active transport and the role of ATP
Explain the processes of endocytosis and exocytosis

33. Active Transport Requires Energy.
ATP (form of energy made by mitochondria).
Moves against the concentration gradient –
LOW to HIGH

34. Active Transport Requires energy Moves molecules from
low to high concentration
Like pedaling up hill on a bike 

35. Endocytosis- Going “IN” to the cell
Transporting material into a cell by the folding of a membrane.

36. Endocytosis- Going “IN” to the cell

38. Exocytosis- “EXITS” the cell
Moves materials out of the cell

40. Summary What is Diffusion? What is Osmosis? What is Active Transport?
What is Passive Transport?

41. Let’s Sketch It- Active v. Passive Transport!

42. Let’s Sketch It- Endocytosis v. Exocytosis

44. SUMMARIZER
On your index card provided, answer the “Learn” question from the front board:
How does the concentration of solutes outside the cell affect it?