The mitochondria produce ATP, which is the energy for the cell. The nucleolus creates ribosomes that the rough ER uses and stores. The smooth ER makes lipids that the cell membrane uses. The cytoplasm holds the organelles in place. The lysosomes break down the waste from the cell. The Golgi packages the vesicles which go around the cells transporting essential stuff for the cell. The cell membrane lets vesicles that the Golgi package in and out.
