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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 plasma membrane is essentially a barrier that separates the interior of the cells from the outside environment. Plasma membrane is also known as a cell membrane. Plasma membranes are present in all kinds of cells, including both animal and plant cells.he main function of a cell membrane is to regulate what enters and exits the cell. The cell membrane also gives a loose shape to the cell and ensures that parts of the cell do not flow away from the cell. The cell membrane consists of a thin layer of amphipathic phospholipids.