What is the primary purpose of the cell membrane?

The primary purpose of the cell membrane is to protect the cell's integrity. The cell membrane, also known as the plasma membrane, serves as a selective barrier that controls the movement of substances in and out of the cell. It maintains the internal environment of the cell by allowing essential nutrients to enter while keeping harmful substances out. This selective permeability is crucial for protecting the cell from damage and maintaining its overall function.

Additionally, the lipid bilayer structure of the cell membrane enables it to create a stable environment necessary for cellular processes. The presence of proteins, carbohydrates, and cholesterol within the membrane further aids in communication, signaling, and overall cell recognition. Therefore, the cell membrane plays a fundamental role in safeguarding the cell’s integrity while facilitating the appropriate exchanges needed for cellular health.