So the foramen or valley is like a one way door that opens this way because of a higher pressure being present inside the right atrium as compared to the left atrium. Now, a small amount of that blood will still make its way into the right ventricle. And when that right ventricle contracts, it will pump that blood into the pulmonary trunk. Now, inside the pulmonary trunk, we also have another type of duct known as the ductus arteriosis. Remember the other type of duct that's known as the ductus venosis, but we're not going to focus on it in this lecture. So we have the ductus arteriosis that connects the pulmonary trunk to the aorter.