How do cell membranes contribute to cell function?

Cell membranes play a critical role in regulating communication between cells, which is essential for maintaining the proper functioning of biological systems. The cell membrane is composed of a phospholipid bilayer embedded with proteins that facilitate communication and signaling pathways. These proteins can act as receptors for signaling molecules, allowing cells to respond to changes in their environment and to coordinate actions with other cells.

The membrane's structure enables it to control what substances enter and exit the cell, thereby influencing how cells interact with one another and their external environment. For instance, when a signaling molecule binds to a receptor on the cell membrane, it can trigger a cascade of intracellular events that can lead to a certain response, such as growth, immune response, or apoptosis (programmed cell death).

While storing nutrients, generating energy, and producing enzymes are vital cellular functions, they are not directly related to the primary role of cell membranes in facilitating communication. Hence, the contribution of cell membranes to regulating communication is fundamental to the overall operation and coordination of cellular processes.