The cell membrane can be compared to a security guard or a gatekeeper. Just like a security guard controls who enters and exits a building, the cell membrane regulates what substances can enter or leave the cell. It is selectively permeable, meaning it allows certain molecules to pass through while blocking others. This ensures that the cell maintains its internal environment and protects it from harmful substances. The cell membrane also communicates with other cells and helps in maintaining the cell’s shape and structure.
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