Now, in the process of anaerobic respiration, we basically take the pyruvate molecules and we reduce the pyruvate molecules into lactate by using NADH. The NADH acts as a coenzyme, and it basically is transformed into NAD plus. And the enzyme that catalyzes this reaction is known as lactate dehydrogenase. So how exactly is this reaction an ordered sequential reaction? So to see what we mean by that, let's take a look at the following five diagrams. So, in diagram A, we basically have the active side.