Now, once we actually synthesize our two pyruvate molecules via glycolysis, if we have oxygen present in the cell, those two pyruvate molecules will then be transported into the mitochondrial matrix of the mitochondria of aracel. And once inside the mitochondrial matrix of aracel, our two pyruvate molecules undergo a decarboxylation process in which we produce two carbon dioxide molecules, two NADH molecules, as well as two acetyl coenzyme A molecules. No ATP molecules are actually synthesized directly in the process of pyruvate decarboxylation. 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.