So it moves this way, then it moves via this valve system and into the pulmonary trunk. Now, once inside the pulmonary trunk, what happens next? Well, this is the second difference between the fully functional adult heart and this developing fetal heart. So we have another type of shunt known as the ductus arteriosis. And because of the ductus arteriosis, and because the pressure inside the pulmonary trunk is higher than the pressure inside this eight order, what happens is to minimize the amount of partially oxygenated blood from going into the lungs, we have the blood going via this duct and into our eight order. So the majority of the blood that actually flows into the pulmonary trunk from the right ventricle goes directly into the systemic circulatory system, into the order bypassing our lungs.