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Aim: How does the structure of the
cell membrane contribute to its
function?
What is the function of the
structure below?
Functions of the cell Membrane
Protection
Controls
what enters and exits
Has Receptors: Allows for cell
communication
Receptors
RECEPTORS
Receptors (proteins in the
membrane) allow for cell
to cell communication.
How?
By receiving
hormones and
neurotransmitters
Cell membrane Structure
lipids
Proteins
Proteins and Lipids
PROTEIN
Lipid
Why is this model called the
fluid mosaic model?
+
=
Fluid: because the membrane moves
Mosaic : because it is made of many
pieces
http://home.earthlink.net/~shalpine/anim/Life/memb.htm
How is the cell membrane
different from an umbrella?
An umbrella is impermeable
It does not allow materials through
How is an umbrella different
from a window screen?
The window screen is permeable
How is a window screen
similar to the cell
membrane?
The cell
membrane is
SEMIPERMEABLE-it
allows materials
through
What will get through the
cell membrane?
Things that are small enough to pass
across!
What is the difference
between these molecules?
They are too big!
Can the elephant get into the
house?
Do all things get through the cell
membrane?
SELECTIVELY PERMEABLE
Why do some things get
through the cell
membrane?
Small molecules are more likely to get
through the cell membrane compared to
big molecules