Well, it's carried by the blood. And that means because these muscles have a lot of oxygen, they also have many capillaries that actually carry the oxygen to those particular muscles. Now, because these have a low contraction speed and because they break down ATP slowly, they also have a high amount of triglycerides. And they have a high amount of triglycerides means our major source of fuel, our major source of ATP is our fatty acids. So these muscles use predominantly triglycerides to break down the fatty acids in aerobic respiration into ATP. So that also means that they have a low fatigue rate.