-An unborn child is in the uterus and he/she is surrounded by amniotic fluid
-at this time the child can not digest/breathe or excrete.
-So to obtain nutrients from the placenta (from the mother)
-The placenta grows from the embryo and the arteries/veins are the ones from the baby
-The placenta grows into the wall of the uterus
-In the bloodstream of the mother there is glucose amino acids and fats, this will flow into the wall of the uterus and cross into the childs blood(at the placenta)
-The placenta has a large surface area and the walls are thin to facilitate the statement above
-Carbon dioxide and urea is exchanged back into the blood of the mother
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