8 Transport part I .pdf
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Original filename: 8 Transport part I.pdf
Title: Cell Structure and Function
Author: Technology Education
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The Cell Membrane
and Movements of
Molecules
The Plasma Membrane
The Plasma Membrane (aka cell
membrane)
Boundary between the cell and its
environment
Controls what enters and leaves the
cell--- performing homeostasis
Has selective permeability- the ability
to allow some molecules through the
membrane -but not others
(aka semi-permeability)
Plasma
Membrane
Water
Plasma Membrane Structure
Fluid Mosaic Model
describes the structure of the plasma
membrane
Fluid: Phospholipids
Polar head- loves water
2 Fatty acid tails- avoid water
Fluid Mosaic Model
Phospholipids in water form a
double layer “sandwich” with tails
pointing in
Fluid Mosaic Model
The sandwich forms a hollow
sphere with an inside and an
outside
Fluid Mosaic Model
The phospholipids are considered
“fluid” because they can move
throughout the membrane.
Fluid Mosaic Model
Mosaic: Proteins
embedded in the phospholipid
bilayer
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