1. Cell Transport
Unit 4

2. What is a cell again?
Remember, a cell is the basic unit of life!

3. How do cells get nutrients and get rid of waste?
Cell transport describes processes that occur across the cell membrane
This is the cell membrane (lipid bilayer)
Lipids

4. What do I need to know before we start?
Concentration- refers to the amount of solute in solvent
More solute = Higher concentration
Less solute = Lower concentration
High Concentration
* * * * *
* * * * * * * * * * * * * * *
* *
Low Concentration.

5. If the process does not require energy…
Processes that do not require energy (ATP) are called passive transport

6. Osmosis Osmosis is a passive transport process.
Water molecules move from an area of high concentration to low concentration through lipid area of cell membrane

7. Hypertonic Solution
More Solute
Less Solute
H20
H20

8. Hypotonic Solution
Less Solute
More Solute
H20
H20

9. Isotonic Solution
Equal solute
Equal Solute
H20
H20

10. Osmosis Practice
Cell
7-3

11. Osmosis Practice
Cell
7-3

12. Osmosis Practice
Cell
7-3

13. Diffusion Diffusion is a passive transport process.
Particles move from an area of high concentration to low concentration through lipid area of cell membrane

14. Facilitated Diffusion
Facilitated Diffusion is a passive transport process.
Particles move from an area of high concentration to low concentration through protein channel area of cell membrane

15. If the process does require energy…
Processes that require energy (ATP) are called active transport
Recall: Which organelle gives the cell energy?
Particles move against the concentration gradient (low to high)

16. Comparing Transport Processes

17. Cell Membrane and the body
Remember homeostasis? The plasma membrane helps keep the cell in balance which keeps your body in balance