Final answer:
The cell membrane controls what enters and leaves the cell, provides a structure, and allows for cell signaling.
Step-by-step explanation:
The cell membrane plays a vital role in the cell's functions. It controls what enters and leaves the cell, a process known as selective permeability. This allows the cell to maintain an internal environment that is distinct from its surroundings, enabling it to carry out various processes such as nutrient uptake and waste removal.
The cell membrane is made up of a phospholipid bilayer, which provides a flexible yet sturdy structure for the cell. It acts as a barrier, separating the internal components of the cell from the external environment. Additionally, the cell membrane contains various proteins and channels that facilitate the transport of specific molecules in and out of the cell.
For example, certain ions, such as sodium and potassium, are actively pumped across the cell membrane, creating an electrochemical gradient that is crucial for nerve conduction and muscle contraction. In addition, the cell membrane also plays a role in cell signaling and communication by allowing the reception and transmission of chemical signals between cells.
Learn more about role of the cell membrane