But in veins, the walls cannot push back. So we have expansion taking place and the pressure remains at a relatively low value. So in A, we have a relaxed vein, but in this diagram, let's call it B when the blood flows and easily pushes against, it expands, but the walls cannot push back and so it remains expanded and the volume increases. In this case, we have an increase by 10%. In this case, we can have an increase by, let's say, 200%. So it doubles in its size.