Krebs Cycle, Citric Acid Cycle, or Tricarboxylic Acid Cycle (TCA) The TCA cycle, is a series of chemical reactions that are used by all aerobic organisms to generate energy. The cycle takes in acetyl-CoA, a molecule that is produced from the breakdown of glucose, and produces carbon dioxide, NADH, FADH2, and ATP. Krebs cycle The compounds that are involved in …