Which of the following statements is TRUE?
A)The mother and the fetus exchange nutrients by exchanging blood in the placenta.
B)Human chorionic gonadotropin maintains the corpus luteum.
C)Human 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)Maternal plasma progesterone levels decline in the weeks leading up to the birth of her baby.

Question

Quizplus · Accepted Answer

Human chorionic gonadotropin (hCG) is responsible for maintaining the corpus luteum during the early weeks of pregnancy, until the placenta takes over progesterone production.

(Note: A is incorrect because the mother and fetus exchange nutrients through diffusion across the placenta, not by exchanging blood directly. C is incorrect because hCG levels peak in the first trimester and then gradually decline. D is incorrect because the placenta takes over as the major source of progesterone production after the first trimester. E is incorrect because maternal plasma progesterone levels continue to rise throughout pregnancy.)

Which of the Following Statements Is TRUE