The placenta allows exchange of oxygen, nutrients, and waste products between the mother and fetus by:
a. Contact between maternal blood and fetal capillaries within the chorionic villi.
b. Interaction of maternal and fetal pH levels within the endometrial vessels.
c. A mixture of maternal and fetal blood within the intervillous spaces.
d. Passive diffusion of maternal carbon dioxide and oxygen into the fetal capillaries.
ANS: A
Fetal capillaries within the chorionic villi are bathed with oxygen-rich and nutrient-rich maternal blood within the intervillous spaces. The endometrial vessels are part of the uterus. There is no interaction with the fetal blood at this point. Maternal and fetal blood do not normally mix. Maternal carbon dioxide does not enter into the fetal circulation.
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