is a cell membrane found in all cells
Active Transport. Endocytosis and Exocytosis. 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.he Structure of the Cell Membrane The cell membrane (or plasma membrane) surrounds all living cells, and is the cell's most important organelle.