Question: what are the 3 shunts in fetal circulation?
Answer: Ductus arteriosus.   protects lungs against circulatory overload.   allows the right ventricle to strengthen. ... 
Ductus venosus.   fetal blood vessel connecting the umbilical vein to the IVC.   blood flow regulated via sphincter. ... 
Foramen ovale.   shunts highly oxygenated blood from right atrium to left atrium.