1. Cell Membrane

2. Cell Membrane (Lipid Bilayer, Plasma Membrane)
Function – Regulates what enters and leaves the cell and also provides protection and support.

3. Cell Membrane (Lipid Bilayer, Plasma Membrane)
Structure – A double layered sheet. Gives the cell membrane a tough, flexible
structure.

4. Cell Membrane (Lipid Bilayer, Plasma Membrane)
Selectively Permeable – Allows only certain substances to pass through.

5. Movement of molecules across a membrane that does NOT require energy.
Passive Transport
Movement of molecules across a membrane that does NOT require energy.

6. Passive Transport
Diffusion – Movement of molecules from an area of high concentration to an area of low concentration.

7. Osmosis – Diffusion of water.
Passive Transport
Osmosis – Diffusion of water.

8. Movement of molecules across a membrane that DOES require energy.
Active Transport
Movement of molecules across a membrane that DOES require energy.