The function of Cell Membrane:

All prokaryotic and eukaryotic cells have a thin and elastic cell membrane, covering the cytoplasm. The cell membrane functions as a semi-permeable barrier, allowing very few molecules across it while fencing the majority of chemicals inside the cell. In this way, the membrane maintains the internal composition of the cell to a constant or nearly constant level. In addition to this vital role, the cell membrane can also sense chemical messages and can identify materials and other cells.