2. The Cell in its Environment The Cell Membrane stars in:

3. What we ALREADY know: Cell membrane is found around the outside of an animal cell and it is the second layer of a plant cell The job of a cell membrane is to let “things” in and out of the cell

4. What we will soon KNOW: The Cell Membrane welcomes needed materials in 3 different ways… The Cell Membrane disposes of unneeded materials inside the cell by sending them out in 3 different ways…

5. Selectively Permeable: = some materials can pass through an object while others cannot Permeable= “to pass though” in Latin 1. Usually permeable to oxygen, water and carbon dioxide 2. Unlikely permeable to large objects and salts

6. 3 Methods of Moving in and out of the Cell: 1. DIFFUSION 2. OSMOSIS 3. ACTIVE TRANSPORT Passive transport

7. A. PASSIVE TRANSPORT: = the movement of materials across the membrane WITHOUT Energy Let’s learn about the methods of PASSIVE transport……..

8. What will happen?!?

9. 1. Diffusion: Process where molecules in high conc. will move to areas of low conc.

10. QUIZ!!!

11. 2. Osmosis: Diff. of H2O Neato fact: osmosis is what makes fresh and salt water fish so different…

12. B. ACTIVE TRANSPORT!!! = the movement of materials through a membrane USING energy

13. 1. Gross… it did what?!?! Endocytosis!!! = 1) the cell membrane surrounds or engulfs a particle and then 2) it will pinch off to form a vacuole around it in the cell (this still uses E)