Following are the important features of fetal circulation: 1. Placenta plays the role of lungs; lungs are not functional: Like pulmonary veins, left umbilical vein carries highly oxygenated blood from placenta to heart. Like pulmonary artery, right and left umbilical arteries braing deoxygenated blood to placenta. 2. Mixing potentially occurs … Continue reading Fetal Circulation Made Easy