Which of the following statements concerning the placenta is correct?
a. The placenta secretes human chorionic gonadotropin, estrogen, and progesterone.
b. The placenta serves the functions of the circulatory, respiratory, and digestive systems for the fetus.
c. Maternal and fetal blood are mixed together within the placenta.
d. Both (a) and (b) above are correct.
e. All of these answers are correct.
A
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