问题
单项选择题
Which of the following functions would the nurse expect to be unrelated to the placenta
A. Production of estrogen and progesterone.
B. Detoxification of some drugs and chemicals.
C. Exchange site for food, gases, and waste.
D. Production of maternal antibodies.
答案
参考答案：D
解析：Fetal immunities are transferred through the placenta, but the maternal immune system is actually suppressed during pregnancy to prevent maternal rejection of the fetus, which the mother’s body considers a foreign protein. Thus, the placenta isn’t responsible for the production of maternal antibodies. The placenta produces estrogen and progesterone, detoxifies some drugs and chemicals, and exchanges nutrients and electrolytes.