The cell membrane is made up of several different substances. The diagram below illustrates the cell membrane and its parts. Extracellular environment Carbohydrate groups Protein Phospholipid Lipid bilayer Cholesterol Cytoplasm Which of the following cell membrane part is responsible for transporting materials into and out of the cytoplasm via active transport or facilitated diffusion? O Carbohydrates Cholesterol Lipids Proteins​