The plasma membrane is a barrier that allows passage of oxygen, nutrients, and wastes for the whole volume of a cell. It is made of a phospholipid bilayer with embedded proteins. The plasma membrane surrounds the cell like a barrier. It looks like a wall or barrier to regulate things going in or out. It contains many integral membrane proteins such as: integrins, cadherins, and desmosomes. These proteins perform different functions that regulate what goes in and out of the cell.
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