Cellular respiration escribes the metabolic reactions and processes that take place in a cell or across the cell membrane to get biochemical energy from fuel molecules and then release of the cells' waste products. Energy can be released by the oxidation of multiple fuel molecules and is stored as "high-energy" carriers. The reactions involved in respiration are catabolic reactions in metabolism. The movement of a pair of electrons down the electron transport chain produces enough energy to form 3 ATP molecules from ADP.