And the process by which ATP synthase one of the enzymes of the electron transport chain phosphorylates ATP into ATP to produce our adenosine triphosphate is known as oxidative phosphorylation. So basically, when ATP molecules are produced without using the electron transport chain, as the case was in glycolysis and the citric acid cycle, that is known as substrate level phosphorylation but using the electron transport chain to produce ATP, that is known as oxidative phosphorylation. Now let's actually summarize our results by looking at the following table. So this table describes how many ATP molecules are actually formed either directly or indirectly by using glycolysis, Pyruvate decarboxylation and the citric acid cycle. So let's begin by looking at glycolysis. So glycolysis actually synthesizes two or a net result of two ATP molecules by substrate level phosphorylation.