Now it also used a type of molecule known as creatine phosphate. Creatine phosphate itself is not actually used directly as an energy source. We use creatine phosphate to pass down the phosphate group onto ADP to form our ATP. Now, the thickness of our muscle fiber for fast oxidative is higher than the thickness in our slow oxidative. And so these produce a slightly higher force than in the case of the slow oxidative. So we have a low diameter of muscle fiber in this case and a medium in this case.