1. Basic Cell Structure The Cell Membrane
The outside of all cells are surrounded by a membrane made of phospholipids.
Nickname: “The gatekeeper”

2. Membrane Structure
There are proteins “stuck” in the membrane that help get things into and out of the cells.
They also help to get messages into the cell.

3. Proteins in Membrane

4. The Membrane is a lipid bilayer.

5. Cell Membrane
Selective Permeability –membrane’s ability to allow SMALL molecules through and keeps LARGE molecules OUT. Helps maintain HOMEOSTASIS.

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

7. Transport through the membrane
Two types
Passive Transport
Energy NOT required
Active Transport
Energy is required

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

9. Osmosis:Diffusion of water through a cell membrane

11. Solutions Higher concentration of solutes = HYPERTONIC.
Lower concentration of solutes is HYPOTONIC.
Equal solute concentrations are ISOTONIC.

12. 3 types of Solutions

13. What types of solution?
Hypertonic Or
Hypotonic

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

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

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

17. Some molecules are too large to get through any type of protein.
Endocytosis
Into
Exocytosis
Out of

18. ENDOCYTOSIS 59

21. Inside of the cell
Outside of the cell
Exocytosis

22. What is rate of transport?
How many molecules can cross the membrane in a given amount of time

23. Effects on Transport Decreases Increases Rate of Transport Large Size
Small
Increases
Temp.
Hot
Cold
Concentration
High
Low

24. Compare/ Contrast
Passive Transport
Active Transport

25. Types of Cellular Transport
high
low
Weeee!!!
Passive Transport
cell doesn’t use energy
Diffusion
Facilitated Diffusion
Osmosis
Active Transport
cell does use energy
Protein Pumps
Endocytosis
Exocytosis
high
low
This is gonna be hard work!!