So for our NADH to get from the cytoplasm to the mitochondrial matrix we have to use a single ATP molecule. And that means the net result. So the net production of our NADH molecule that comes from glycolysis is not three, but only two ATP molecules because we had to use that one ATP molecule when we went from the cytoplasm into the mitochondrial matrix. So our NADH molecules produced in the mitochondrial matrix via the citric acid cycle or our pyruvate decreboxylation basically produces a net result of three ATP molecules. But the NADH produced in glycolysis produces a net result of only two ATP molecules. So let's basically summarize our results of what the electron transport chain is and how it actually works.