What is the structure and function of cell membrane?

The structure of the cell membrane is a thin, flexible barrier made up of a phospholipid bilayer with proteins, and its main function is to protect the cell and control the movement of substances in and out.

The cell membrane, also called the plasma membrane, plays a vital role in every living cell. It is selectively permeable, which means only some substances can pass through. This control helps the cell maintain balance, known as homeostasis.

Structure of Cell Membrane

• Phospholipid Bilayer: Two layers of phospholipids form the base. Each phospholipid has a hydrophilic head (water-loving) and a hydrophobic tail (water-hating).
• Proteins: Embedded proteins act as transport channels, receptors, and enzymes.
• Carbohydrates: Found on the surface, they help in cell recognition and communication.
• Cholesterol: Maintains fluidity and stability of the membrane.

Functions of Cell Membrane

• Controls exchange of materials (oxygen, nutrients, waste).
• Provides protection and support.
• Helps in cell signaling through receptors.
• Allows movement of the cell in some organisms.

Thus, the cell membrane is both a protective barrier and a gateway that manages communication and transport for the survival of the cell.