Cellular Respiration
Your Acetyl CoA molecule enters the Citric Acid Cycle (Kreb's Cycle). Your molecule is attached to the metabolites from the previous sequence. Then, your molecule goes around one sequence of the Citric Acid Cycle, oxidizing 3 NADH and 1 FADH2 for the next step. As a hydrogen molecule, you leave the Citric Acid Cycle and continue on in NADH or FADH2. Two ATPs are produced through substrate-level phosphorylation.