Once the end products (pyruvic acid and hydrogen atoms), of glycolysis, enter the mitochondria the pyruvic acid undergoes a reaction in which it forms a compound with just 2 carbon atoms (the third carbon is converted to CO2). This new compound is referred to as C2 acid. The C2 acid then interacts with a series of enzymes. This encounter is known as the tricarboxylic acid cycle (TCA) or the Krebs' cycle. To begin, the C2 acid binds with C4 acid, resulting in C6 acid. It then gets rearranged multiple times (each time being lead by a different enzyme). Upon completion, the original C4 is ready to go through the cycle once again, the two carbons from the C2 acid have been converted to CO2 and have left the cell (as waste), and the energy from