Gynaecology & Obstetrics Which of these is true of fetal circulation? A Fetal hea chambers work in series to effectively supply brain and hea with higher oxygenated blood B The ductus venosus is the main branch of umbilical aery C The oxygen content of blood delivered to hea from IVC is higher than that leaving the placenta D The more oxygenated blood in the right atrium crosses the foramen ovale to the left atrium 💡 Explanation Which of these is true of fetal circulation? ✓ Correct Answer: D. The more oxygenated blood in the right atrium crosses the foramen ovale to the left atrium