you you more high-revate, it removes a carbon that's lost to CO2 waste. The resulting two carbon molecules linked to CoA are called acetyl CoA. Acetyl CoA enters the citric acid cycle where the CoA lets go and the two carbon molecules link up to a four carbon molecule called acetyloacetate to form a six carbon molecule called citrate or citric acid. NAD plus picks up an electron from the citrate and then becomes NADH and heads to the electron transport chain. A carbon molecule is lost by citrate to CO2 and it becomes a five carbon molecule. Another carbon molecule is lost to CO2 and it becomes a four carbon molecule. A phosphate group is added to an ADP molecule making ATP. FAD then picks up an electron to become FADH2 and heads the electron transport chain. NAD plus picks up an electron, becomes NADH and also heads to the electron transport chain. The four carbon molecule left in the cycle is acetyloacetate which can link to another acetyl molecule and the cycle can repeat.