Indian J Pediatr. 1991 Jul;58(4):441-451. doi: 10.1007/BF02750928.
Indian journal of pediatrics
P Syamasundar Rao
PMID: 28326498 DOI: 10.1007/BF02750928
CONCLUSION: Fetal circulation is designed to utilize placenta for gas exchange whereas postnatal circulation uses lungs for gas exchange. Fetal circulatory pathways, namely, umbilical vessels, ductus venosus, foramen ovale and ductus arteriosus facilitate placental gas exchange and promote distribution of oxygenated blood to the vital organs of the fetus. Mechanical factors, prostaglandins and low PO