Which of the following statements is true?
A)The mother and the fetus exchange nutrients by exchanging blood in the placenta
B)Chorionic gonadotropin maintains the corpus luteum
C)Chorionic gonadotropin levels are the highest at the end of pregnancy
D)From the time of implantation through delivery, the corpus luteum is the major source of progesterone
E)All of the choices are true

Question

Quizplus · Accepted Answer

Chorionic gonadotropin (CG) is produced by the developing placenta and maintains the corpus luteum, which in turn produces progesterone to support the early pregnancy. The other options are not entirely accurate: A is partly true, but the mother and fetus do not directly exchange blood (nutrients and waste products are exchanged across the placental barrier); C is false, as CG levels are highest in the first trimester and then decline; D is also false, as after 8-12 weeks of pregnancy, the placenta takes over as the primary source of progesterone.

Which of the Following Statements Is True