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The plasma membrane, also known as the cell membrane, is a thin, flexible layer of lipids and proteins that surrounds and encloses the contents of a cell. It separates the interior of the cell from the outside environment and helps maintain the cell's shape and internal environment.

The lipid bilayer is the main structural component of the plasma membrane, consisting of two layers of phospholipids that form a barrier to the movement of water-soluble molecules. Proteins embedded in the lipid bilayer serve various functions, including transport of molecules across the membrane, cell signaling, and structural support.

The plasma membrane is selectively permeable, meaning that it allows certain substances to pass through while preventing others from entering or leaving the cell. This property is essential for the cell to maintain its internal environment and perform vital functions such as nutrient uptake and waste removal.

Overall, the plasma membrane plays a crucial role in maintaining the integrity and functionality of the cell.

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