And that's exactly what happens as we'll see in just a moment. So at the same time we're running, we also have these red blood cells which are also carrying out many different types of processes. And so in these cells, the red blood cells also uptake these glucose molecules from the bloodstream because they need to use the glucose to form the ATP. And so glycolysis takes place in the urethra site. And once we form the Pyruvate, because it doesn't have any mitochondria, it can't use aerobic respiration, so it depends strictly on fermentation. And so we transform the Pyruvate into lactate and just like in this case, it diffuses into the bloodstream.