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The main role of the cell membrane is to provide protection to the cell from its surroundings. The cell membrane or plasma membrane controls the passage of some solutes and water into and out of the cell.

All cells include a membrane, known as the cell membrane or the plasma membrane, which isolates the inside of the cell from the external world. Materials moving into and out of the cell are controlled by the cell membrane. Objects that have been dissolved in a solution are referred to as solutes. In a fluid solution, there are more solvent molecules than solute molecules. One of the most typical solutes in our daily life is salt, followed by water. In water, salt dissolves, making it the solute.

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