Which structure separates intracellular fluid from extracellular fluid and functions like a semipermeable filter?

Question

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Each cell is surrounded by a cell membrane that separates intracellular fluid from extracellular fluid. The cell membrane is semipermeable, like a filter, and may contain openings that function like gates in a fence and allows some materials to pass freely and blocks passage of others.

Which Structure Separates Intracellular Fluid from Extracellular Fluid and Functions