8-step animated pathway — NADH, FADH₂, GTP, acetyl-CoA entry
The Krebs cycle (Citric Acid Cycle) completes aerobic respiration, producing 3 NADH + 1 FADH₂ + 1 GTP + 2 CO₂ per acetyl-CoA turn. NADH and FADH₂ feed electrons to the electron transport chain, ultimately yielding ~10 ATP per turn. Two turns per glucose molecule means ~20 ATP from the cycle alone (plus 32 from ETC).