The cell membrane, also known as the plasma membrane, is a thin, flexible barrier that surrounds the cell. Made mainly of lipids and proteins, the cell membrane controls what enters and leaves the cell, allowing nutrients in and keeping harmful substances out. It also helps cells communicate with each other and supports the cell's shape. By regulating these activities, the cell membrane ensures that the cell maintains a stable internal environment, which is essential for the cell's survival and proper functioning.
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