plasma membrane

The plasma membrane is a thin, flexible barrier that surrounds and protects every cell in living organisms. It's composed of a double layer of lipids (fats) with embedded proteins, which regulate what enters and exits the cell. This membrane helps maintain the cell's internal environment, allowing essential nutrients to enter while keeping harmful substances out. It also plays a vital role in communication between cells and their surroundings. Essentially, the plasma membrane serves as a gatekeeper, ensuring that the cell operates efficiently and safely within its environment.