placenta meaning

noun the tissue whichgrows inside the uterus during pregnancy and links the baby to the motherCOMMENT: The vascular system of the fetus isnot directly connected to that of the mother. The placenta allows an exchange of oxygen and nutrients to be passed from the mother to the fetus to which she is linked by the umbili- cal cord. It stops functioning when the baby breathes for the first time and is then passed out of the uterus as the afterbirth.placental