What is the function of the cell membrane?

The cell membrane serves a crucial role in protecting the cell and maintaining its structure. It acts as a barrier that surrounds the cell, regulating what enters and exits, which is essential for maintaining the internal environment of the cell. This selective permeability ensures that essential nutrients can enter the cell while waste products and harmful substances are kept out. Additionally, the cell membrane contributes to the overall shape and integrity of the cell, allowing it to maintain its physiological functions efficiently. This protective and structural function is fundamental to the survival and proper functioning of all living cells.