2. The Cell Membrane Selectively permeable (semi-permeable)
allows only certain substances to pass through
cannot control the movement of water
Cell membrane

3. The fluid mosaic model
double layer of lipids with proteins scattered throughout
flexible, phospholipids move with in the membrane

4. Main Structures of the Cell Membrane

5. Parts of the Cell Membrane
Transport Proteins- allows needed substances or waste materials through membrane

6. Parts of the Cell Membrane
Cholesterol
stabilizes the phospholipids
does not allow fatty acid chains to stick together
cholesterol

7. How do molecules get into and out of a cell?

8. Diffusion
Movement of molecules from a place of higher concentration to a place of lower concentration
Always higher to lower!
No energy input required!

9. Osmosis:Diffusion of water through a cell membrane

11. Transport through the membrane
Two types
Facilitated Diffusion
Energy input NOT required
Active Transport
Energy input required

12. Facilitated Diffusion
Energy is NOT required to move substances across the membrane.
Protein

13. Facilitated Diffusion
Glucose
molecules
High
Concentration
Protein
channel
Cell Membrane bilayer
Low
Concentration

14. .

15. Active Transport Energy is required.
Need ATP- the universal energy molecule.
Low to high

17. Other ways to get molecules into and out of a cell
Some molecules are too large to get through the membrane.
Endocytosis
Into
Exocytosis
Out of

18. ENDOCYTOSIS

21. 62
Inside of the cell
Outside of the cell
Exocytosis

22. 3 types of Solutions

23. The solution with the higher concentration of solutes is hypertonic.
The solution with the lower concentration of solutes is hypotonic.
These are comparative terms.
Tap water is hypertonic compared to distilled water but hypotonic when compared to sea water.
Solutions with equal solute concentrations are isotonic.

24. What types of solution?
Hypertonic Or
Hypotonic

26. Plasmolysis