The main aim of the citric acid cycle is to generate energy from the electrons harvested from sugar molecules like glucose. Upon entering the citric acid cycle, acetyl-CoA goes through a series of reactions losing its acetyl group as carbon dioxide. During the oxidative steps of the cycle, the electrons are transferred to NAD+, generating NADH. GTP produced from the conversion of succinyl-CoA to succinate is readily converted to ATP. In the next reaction, the electrons from succinate oxidation are used to reduce FAD to FADH2. Thus, each turn of the TCA cycle generates two CO2 molecules, three NADH, one FADH2, and one ATP. The cycle must go around twice since oxidation of each glucose molecule generates two pyruvates. Therefore, for every glucose molecule oxidized, the citric acid cycle generates four CO2, six NADH, two FADH2, and two ATP molecules. The coenzymes—NADH and FADH2—generated from the TCA cycle are utilized during oxidative phosphorylation to produce more ATP.