A - Rough Endoplasmic Reticulum - sheet-like internal membrane filled with ribosomes where protein synthesis takes place B - Cytoplasm - gel-like matrix that contains all the organelles C - Golgi Complex - collects molecules, packages them inside vesicles, stores the formed molecules or distibutes them in the cell. D - Nucleolus - produces ribosomes E - Nucleus - the brain of the cell; controls all the processes in the body F - Mitochondrion - where oxidative metabolism happens, produces energy from food G - Smooth endoplasmic reticulum -tubular shaped internal membrane where lipids and steroids are stored H - Peroxisome - contains important enzymes to be used in various metabolic reactions I - Plasma Membrane - encloses the contents of the cell, made up of lipids and proteins