And so they will carry the oxygen to the lungs. And that's okay because the lungs do need a small amount of oxygen to actually develop further. So once our partially oxygenated blood travels into our order, what happens is it begins to move into the tissues and organs found in the upper portion of that fetus and the lower portion of that fetus. Eventually, that deoxygenated blood will enter these internal iliac arteries and they will connect with these umbilical, arteries, and that will carry the deoxynated blood back into the placenta. And once again, inside the placenta, we have the oxygenation of that blood and the nutrients flow into that blood once again. And so the fetal blood now contains the oxygen nutrients, and the cycle can basically start over again.