1. Aim: How does the structure of the cell membrane contribute to its function?

2. What is the function of the structure below?

3. Functions of the cell Membrane
Protection
Controls what enters and exits
Has Receptors: Allows for cell communication

4. Receptors By receiving hormones and neurotransmitters RECEPTORS
Receptors (proteins in the membrane) allow for cell to cell communication.
How?
By receiving hormones and
neurotransmitters

5. Cell membrane Structure
lipids
Proteins

6. Proteins and Lipids
PROTEIN
Lipid

7. Why is this model called the fluid mosaic model?+ =
Fluid: because the membrane is able to move.
Mosaic : because it is made of many pieces

8. How is the cell membrane different from an umbrella?
An umbrella is impermeable
It does not allow materials through

9. How is a cell similar to a window screen?
The window screen is permeable

10. How is a window screen similar to the cell membrane?
The cell membrane is SEMI-PERMEABLE-it allows certain materials to pass through

11. What will get through the cell membrane?
Things that are small enough to pass across!

12. What types of materials can pass across?
CO2
H20
simple sugars
Amino acids

13. Why can’t starch pass across?
They are too big!

14. Can the elephant get into the house?

15. Do all things get through the cell membrane?
SELECTIVELY PERMEABLE
PICKY OR CHOOSEY
ABLE TO PASS
Only certain materials are able to pass across the membrane!

16. Why do some things get through the cell membrane?
Small molecules are more likely to get through the cell membrane compared to big molecules