Well, as a result of a thick layer of smooth muscle that makes the artery not only elastic and stretchy, but it also gives it very high recoil capabilities. So what that basically means is as the blood actually flows through our blood vessel, through the artery, the artery slightly expands as a result of that increase in blood flow. But because it has a thick layer of smooth muscle, you can think of this as being a rubber band. When you stretch the rubber band, it wants to return back to place. And in the same way, because of this thick layer of smooth muscle, when you stretch the artery, it wants to return back into place. So it expands, but it quickly recoils, returns to place.