The amniotic sac, placenta, and umbilical cord are some of the first tissues to form. The placenta is a flat organ that attaches to the uterine wall, where nourishment is passed from mother to baby through the umbilical cord. Inside the umbilical cord, two arteries carry nourishment to the baby and a vein carries waste away. The amniotic sac surrounds the fetus throughout the entire pregnancy. It is filled with amniotic fluid for protection and to help regulate temperature.
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