1. Do Now: How is the cell membrane shown below like a colander?11
- The Cell in Its Environment
Do Now: How is the cell membrane shown below like a colander?
Homework:
The cell in its environment worksheet
Mini Quiz Wednesday October 3rd.
2. Test on Wednesday, October 10th. .

2. Cell membrane is selectively permeable-
some substances can pass through, while others cannot.
Permeable to: oxygen, water, carbon dioxide
Not permeable (impermeable) to: large molecules and salts

3. There are three methods by which substances move into and out of the cell: diffusion, osmosis or active transport

4. 1) DIFFUSION: the process by which molecules move from an area of higher concentration to an area of lower concentration (high concentration--> low concentration) Demonstration: air freshener Example in text: page 41 unicellular organism in pond water..  
-Molecules are always moving-they collide and push off each other until they are spread out evenly -Molecules diffuse through the cell membrane

5. Example in text: Page 42 red blood cell
2)OSMOSIS: diffusion of water molecules through a selectively permeable membrane, from high to low concentration.
Demo: Raisins in water
Example in text: Page 42 red blood cell

6. - The Cell in Its Environment66
- The Cell in Its Environment

7. - The Cell in Its Environment77
- The Cell in Its Environment
Concentration of water is the same inside the cell as it is outside the cell
What happened to the cell? It stays the same size

8. Concentration of water is lower outside the cell.88
Concentration of water is lower outside the cell.
What happened to the cell?
It will shrink/shrivel

9. Concentration of water is higher outside the cell.99
Concentration of water is higher outside the cell.
What happened to the cell?
It will expand or even explode

10. the movement of materials through a cell membrane using energy
3) ACTIVE TRANSPORT:
the movement of materials through a cell membrane using energy
(low  high concentration) -
-Used when molecules need to move in the opposite direction then they would normally move by diffusion
-Transport proteins can “pick up” molecules outside the cell and carry them in—this uses energy

11. The movement through a cell membrane without using energy is called passive transport The main difference between active transport and passive transport is: For active transport the cell must use energy. For passive transport the cell does not use energy.

12.
- The Cell in Its Environment
Active Transport takes materials from a low concentration to a high concentration.
There are transport proteins that help this happen and these transport proteins require energy to work.

13. What will be on the test? Characteristics of Living Things
Needs of Living Things
The experiments: Is it a living thing lab, understand Redi and Pasteur concepts.
Cell Theory
Cells and their organelles
Cell Transport (diffusion, osmosis and active transport)

14. BrainPOP