Final answer:
The student seems to be asking about the connection between the venous duct and the posterior vena cava, but the term 'posterior vena cava' is not standard. The inferior vena cava is the vessel that drains blood from areas below the diaphragm into the right atrium, and in fetal anatomy, the umbilical vein is connected to the inferior vena cava by the ductus venosus, not a 'venous duct'.
Step-by-step explanation:
The student is asking about the connection between the venous duct and the posterior vena cava, which is more commonly referred to as the inferior vena cava. This large vein is responsible for draining blood from most areas inferior to the diaphragm and empties into the right atrium of the heart. However, within the context of the question, there seems to be a minor error in terminology, as typically in human anatomy there is no 'venous duct' that connects to the inferior vena cava. Instead, if we are discussing fetal circulation, the 'ductus venosus' is the vessel that connects the umbilical vein to the inferior vena cava. The ductus venosus allows blood to bypass the liver in a fetus and is connected to the umbilical vein rather than any posterior vena cava because the term 'posterior vena cava' is not standard in human anatomy.