The plasma membrane consists of lipids and proteins. The structure of the plasma membrane is the phospholipid bilayer which is the basic formation of biological membranes. It forms a constant barrier between two aqueous compartments. In the case of the plasma membrane, the compartments are the inside and outside of the cell. The proteins that are implanted within the phospholipid bilayer carry out the detailed functions of the plasma membrane that includes selective transportation of molecules and cell-cell gratitude. The passive process of the plasma membrane doesn’t use energy to move substances down their absorption grade, ex. of passive transport is rolling a ball down a hill. Active transport process of the plasma membranes processes use energy to move substances across the membrane, ex. of active transport is pushing a stroller up a hill.