So within minutes of taking the first breath, the Foraymon O valley is closed. Now, let's move on to the ductus venosis. So what happens to the ductus venosis? Well, once that fetus is born, what the physicians do is they essentially clamp down the umbilical cord, and that causes the clamping of umbilical vein. So at this particular location, we clamp down umbilical vein, and that creates a high resistance within this section. And so what happens is blood essentially stops flowing within this section of our blood vessel.