Question

why is the plasma membrane called selectively permeable membrane?

Answer 1

plasma membrane is called selectively permeable membrane because it allow some specific things such as plasma of cell to pass through it whereas it doesn't allow cell bodies and other things to pass through it
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Answer 2

Because it regulates the movement of substances in and out of the cell. This means that plasma membrane allows the entry of only some substances and prevents the movement of some other materials.

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