Population Statistics within the Arizona Department of Administration and does not necessarily reflect the official position of the U.S. Department of Labor. The Department of Labor makes no guarantees, warranties,
The Cell Membrane. The Structure of the Cell Membrane. The cell membrane (or plasma membrane) surrounds all living cells, and is the cell's most important organelle. It controls how substances can move in and out of the cell and is responsible for many other properties of the cell as well.
The function of cell membrane is to act as a boundary between the inside of the cell ad its surrounding environment. It is made up almost entirely of a phopholipid bi layer and proteins. Molecules that are water soluble are unable to pass though the phospholipid bi layer due to the hydrophobic internal.