STRUCTURE & FUNCTION OF THE CELL MEMBRANE
Composition of the Cell Membrane:
cell (plasma) membrane
of cells. The plasma membrane forms a
boundary between the inner cell and the outside environment.
It controls the passage of materials in and
out of the cell.
The cell membrane consist of a double layer of phospholipids embedded with proteins.
We often call it the
or phospholipid bilayer
(fats with phosphorous attached).
Each phospholipid molecule has a head (charged phosphate group & a glycerol), that is attracted to water
= loving) and 2 tails (lipid chains), that repels water
= fearing). Both layers of the plasma membrane have the
hydrophilic heads pointing toward the outside; the hydrophobic tails form the inside of the bilayer. (see
Color and Label the phospholipid bilayer (cell membrane).