8 Transport part I (PDF)

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Title: Cell Structure and Function
Author: Technology Education

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The Cell Membrane
and Movements of

The Plasma Membrane

The Plasma Membrane (aka cell
 Boundary between the cell and its
 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 Structure

Fluid Mosaic Model
describes the structure of the plasma
 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

Fluid Mosaic Model

The phospholipids are considered
“fluid” because they can move
throughout the membrane.

Fluid Mosaic Model

Mosaic: Proteins
 embedded in the phospholipid

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