Fetal circulation describes the flow of blood in the fetus. This flow of the blood is usually complicated compared to the blood flow in the normal human being. In the fetus, the placenta does the work of the lungs. After the baby is born, the lungs take over the function from the placenta. Blue blood from the fetus reaches the placenta through umbilical arteries (Woollett, 2011). The placenta performs the purification of blood and converts into oxygenated blood (red blood). Red blood flows back to the fetus through the umbilical vein. It passes through the fetal liver before it Continue reading...