Which of the following occurs in the placenta?
A) All substances in maternal blood that may be harmful to the fetus are prevented from moving across the walls of the villi.
B) Fetal blood and maternal blood mix.
C) Eroding blood vessels in the endometrium bathe chorionic villi in pools of maternal blood.
D) Hormones are absorbed to prevent them from influencing the developing fetus.
E) The amnion and the chorion grow into the endometrium.

Question

Quizplus · Accepted Answer

Eroding blood vessels in the endometrium bathe chorionic villi in pools of maternal blood, which is how the exchange of nutrients, gases, and waste products occurs between maternal and fetal blood. The placenta facilitates this exchange without direct mixing of the blood from the mother and fetus.

Which of the Following Occurs in the Placenta