Cell Membrane Notes

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11/13/16
Cell/Plasma Membrane Notes
Ch. 7.2 Plasma Membrane (p.175-178)
Ch. 8.1 Cellular Transport (p.195-200)
Page ___
Cell/Plasma Membrane
“Gatekeeper”
1.  ALL cells have a Cell
Membrane
2. Functions:
a. Controls what enters and
exits the cell to maintain
homeostasis (example:
body temperature, pH,
blood sugar, water
balance)
b. Provides protection and
support for the cell
3. Structure of cell membrane
(LIPIDS & PROTEINS)
Lipid Bilayer -2 layers of
phospholipids
TEM picture of
a real cell
membrane.
a. Phosphate head is polar
(water loving)
b. Fatty acid tails non-polar
(water fearing)
c. Proteins embedded in
membrane
Phospholipid
Lipid Bilayer
1
11/13/16
Polar heads Fluid Mosaic
love water
Model of the
& dissolve. cell membrane
Membrane
Movement
animation
Non-polar
tails hide
from water.
•  4. Cell membranes have pores (holes) in it
which makes it Selectively Permeable:
Allows some molecules in and out the cell
Carbohydrate cell
markers
Proteins
Structure of the Cell/Plasma
Membrane
“Use Notes”
Outside of cell
Lipid
Bilayer
Transport
Protein
Animations
of membrane
Go to structure
Section:
Carbohydrate
chains
Proteins
Phospholipids
Inside of cell
(cytoplasm)
Cell/Plasma Membrane Exit
Ticket
ANSWER THE FOLLOWING:
1. What is the function of the cell membrane?
2. Describe the structure of the cell membrane?
3. How many layers of lipids are there in the
plasma membrane?
4. What does selective permeable mean?
5.  True or False: ALL cells have cell
membranes.
2
11/13/16
Cell Membrane Drawing & Questions
Notebook Page ____
Front---Draw, Color, Label & Descriptions
•  Page 177 Figure 7.4
Back---Write questions & answers
1.  The cell membrane is selectively permeable. Define
selectively permeability.
2.  Why do the polar heads of the phospholipids face
the outside of the membrane?
3

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