Well, because in cardiac muscle cells we only use aerobic respiration, never anaerobic respiration. There's always plenty of oxygen inside these cells and this helps these cardiac muscle cells obtain an additional source of energy and also helps conserve the glucose in the blood so that other cells can actually use the glucose, for instance, brain cells. Now the second place where these lactate molecules end up is the liver cells. And what happens to the liver cell or what happens to these lactate molecules in liver cells is known collectively as the chloride cycle and we'll focus on that in much more detail in a future lecture. So lactate essentially goes into these liver cells. Now, once lactate goes into the liver cell, the lactate is transformed into Pyruvate and that can go in many different directions.