And so inside the lungs, we have a high resistance and a high pressure. And the same thing is true inside the liver. Now, if the blood were to actually move through the liver and through the lungs, that will greatly decrease the flow rate of that blood inside the fetal circulatory system. And to prevent that from happening and to create a quick and efficient circulatory system of that fetus, what the fetus does is it redirects blood away from those two organs via special type of pathogeways, special types of Shuns known as the ductus arteriosis, the ductus venosis and the Forayman O'Valley. So remember, it's inside the placenta where gas exchange and nutrient exchange takes place. And as soon as that takes place, the oxygenated and nutrient filled blood will travel away from the placentum and towards this general direction via the umbilical vein.