Download Diffusion and Osmosis In this lesson you will learn about how cells

Diffusion and Osmosis
In this lesson you will learn about how cells get important particles like water and glucose in and out of a
cell. We know from studying cell parts that they go in and out through the cell’s membrane, but what
causes them to go in or out?
First we are going to need to know the meaning of some word we are going to come across as we
investigate.
Pure:
Solution:
Concentration:
Low Concentration:
High Concentration:
1.
Go to website 2:
http://www.biology.ualberta.ca/facilities/multimedia/uploads/alberta/dif.html
2. Choose Diffusion from the Main Menu
3. In the 1st box draw the particles before diffusion (before the animation starts)
4. In the 2nd box draw the particles after diffusion (after the animation stops)
Before diffusion
After diffusion
5. Based on what you saw, what is Diffusion?
Diffusion is …
6. Go to website 1: http://leavingbio.net/osmosis%20and%20diffusion.htm#difan
At the top of the page copy down the definition of Diffusion.
Diffusion is…
7. Does diffusion need energy to happen? The answer is on this same page.
Osmosis
8. Go to Website 2
http://www.biology.ualberta.ca/facilities/multimedia/uploads/alberta/dif.html
9. Choose Osmosis from the main menu
10. In the 1st box draw the particles and water before osmosis. Be sure to copy down the
molecules, liters, and molecules/liter.
11. In the 2nd box draw the particles and water after osmosis. Be sure to copy down the molecules,
liters, and molecules/liter.
___ molecules
___ molecules
___ molecules
___ molecules
___ liters
___ liters
___ liters
___ liters
___ molecules/liters
___ molecules/liters
___ molecules/liters
___ molecules/liters
before osmosis
12. What moved? The water or the other particles?
after osmosis
13. Where did it move to?
14. Based on what you observed what is osmosis?
Osmosis is….
15. Go to Brainpop.com and log in. Login = chaparralms Password = cougarz
16. Search for “diffusion” and watch the video clip.
17. After the video is done. Choose the FYI: Read More and read about osmosis.
18. Copy the definition for osmosis here:
Osmosis is…
19. Go to webpage 1 scroll down to where it says “osmosis and cells.
20. Draw the red blood cells and plant cells in 3 water solution.
Hypertonic: Water
concentration is
lower outside of the
cell.
Hypotonic: Water
concentration is
higher outside of
the cell.
Isotonic: Water
concentration is
equal outside and
inside the cell.
21. Answer these questions for homework. Look over the information gathered in this lab to help.
What happened to the cells in the hypotonic solution and why?
What happened to the cells in the hypertonic solution and why?
What happened to the cells in the isotonic solution and why?