Now, the problem with the liver in the fetus is the liver is underdeveloped. It is not fully functional. And what that means is we should not waste that oxygen and nutrients onto the liver, because the liver doesn't yet function the same way does in the adult individual. And so what the fetal circulatory system does is it conserves some of that oxygen and the nutrients inside the blood by shunting or redirecting that blood away from that liver and directly into thin fear venecava. And this takes place as a result of the presence of a special type of duct within the circulatory system of that fetus known as the ductus venosis. So the ductus venosis is a small type of blood vessel that creates a pathoge way that allows the oxygenated and nutrient filled blood to bypass the liver and go directly into the inferior venecaiva.