What are plasma membranes?

Plasma membranes are selectively permeable membranes which allow only selected substances required by the cell to move through the membrane whereas substances not needed by the cell are not absorbed or taken inside the cell by the plasma membranes.

The plasma membrane is a layer of lipid and protein separating the inside of a cell from the outside.

 Plasma membranes are network of lipids and proteins that forms the boundary between a cell’s contents and the outside of the cell.