Maternal and fetal blood supplies mix to facilitate exchange.
Maternal and fetal blood supplies do not mix,but are side-by-side.

Question

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Maternal and fetal blood supplies do not mix, but they come into close proximity in the placenta to facilitate exchange of nutrients, gases, and waste products between the mother and fetus. The exchange occurs across a selectively permeable membrane called the placental barrier that separates the maternal and fetal blood supplies.

Maternal and Fetal Blood Supplies Mix to Facilitate Exchange