So this citric acid cycle takes place twice for any given glucose molecule, and this citric acid cycle takes place within the mitochondrial matrix of the mitochondria found within the cell. So let's take a look at each one of these eight steps. And we're not going to focus too much on the detail, because each one of these steps is actually pretty complicated. It contains many enzymes and many intermediates. So we're going to simply paint the general picture of this cycle. Let's begin with step number one.