The placenta
A) forms from endometrial and extraembryonic tissues.
B) will cover about one-fourth of the inner uterine surface at full term.
C) does not normally intermingle fetal blood with maternal blood.
D) secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters.
E) does all of these.

Question

Quizplus · Accepted Answer

The placenta is formed from both endometrial and extraembryonic tissues, it covers about one-fourth of the inner uterine surface at full term, it intermingles fetal blood with maternal blood to exchange nutrients and waste products, and secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters. Therefore, choice E is the best answer.

The Placenta