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taskmasters
A thin, flexible, semipermeable barrier around the cell which regulates what enters and leaves the cell is called the cell membrane. The cell membrane is a biological membrane that separates the interior of all cells from the outside environment. Hope this answers the question.
syed514
The cell membrane is a thin flexible semipermeable barrier around the cell that regulates what enters and leaves the cell 
it allows some material and some not to pass through
hope it helps