The cell membrane regulates the transport of materials entering and exiting the cell. Describe the structure of the cell membrane. Fluid Mosaic Model Of Cell Membrane S Structure Idil Ugurlu Thinglink Cell Membrane Coloring Worksheet Cell Membrane Structure Plasma Membrane Membrane Structure and Function. . It is selectively permeable which means that it only lets certain molecules enter and exit. The plasma membrane or the cell membrane provides protection for a cell. To protect the cell from its surroundingsIt also recognizes certain chemicals and molecules that can or cant go into the cell. The cell membrane is the outer covering of a cell and helps it maintain shape as well as allows certain molecules to enter and leave the cell. It is semipermeable that is why function as check post of cell allowing only relative molecules. As previously mentioned the cell membrane serves as a barrier that can open to allow certain ne...