What is a primary function of the cell membrane?

The primary function of the cell membrane is to hold cells together and regulate material movement. The cell membrane, also known as the plasma membrane, serves as a critical barrier that separates the interior of the cell from the external environment. It is composed of a phospholipid bilayer with embedded proteins, which facilitate the transport of substances in and out of the cell. This selective permeability allows the cell to maintain homeostasis by controlling the entry of essential nutrients and the exit of waste products.

Additionally, the cell membrane plays a vital role in cell signaling and communication, as receptors on its surface can detect and respond to various signals from the environment. This function is essential for processes like nutrient absorption and responses to extracellular stimuli, ensuring that the cell operates efficiently and effectively within its environment. Overall, the cell membrane is integral to maintaining the integrity and functionality of the cell.