1. pH Scale A system of classifying how acidic or basic something is. 0-6
8-14
Neutral

2. How are things able to move in and out of the cell?
Cell Transport
How are things able to move in and out of the cell?

3. Cell Membrane
Forms a boundary between a cell and the outside environment
Controls the passage of materials in and out of cell

4. Semi-Permeable
The cell membrane allows some, but not all, materials to cross
*…allows a cell to maintain homeostasis in spite of unpredictable conditions outside of cell
Example: Fish net or coffee pot

5. Cell Transport
Can be active or passive

6. Passive Transport
Movement of molecules across a cell membrane without energy input from the cell
No additional energy required, but can be slow!

7. Diffusion
Movement of molecules from an area of high concentration to an area of low concentration
Example: cookies in the oven

8. Osmosis The diffusion of water across a semipermeable membrane
Regulates a cell’s water content

9. Summary
*Diffusion and osmosis are both methods by which substances can be moved.
Diffusion is the movement of particles (salt, sugar, ink, air, etc.).
Osmosis is the diffusion of water across a permeable membrane.