Now let's move on to our citric acid cycle. The citric acid cycle, also known as the KREP cycle or the tricarboxylic acid cycle, basically involves using our acetyl coenzyme A molecules produced in pyruvate decarboxylation. So basically, the citric acid cycle is an eight step cycle that transforms a single acetyl coenzyme A molecule into three NADH molecules, one GTP molecule that is later transformed into ATP, as well as one Fadh two molecule. And since we have two acetyl coenzyme A molecules produced from one glucose, the breakdown of a single glucose basically leads to the production of six NADH, two Fadh twos and two GTPs, which is basically two multiplied by these quantities that we discussed earlier. Now, in the same way that the production of ATP and glycolysis takes place via substrate level phosphorylation producing our GTP, our Guanosine triphosphate and then ATP from the GCP takes place via the substrate level phosphorylation. Now let's move on to the electron transport chain.