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In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was:

  1. A
    High level of circulating HCG to stimulate estrogen and progesterone synthesis
  2. B
    High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo
  3. C
    High level of circulating HCG to stimulate endometrial thickening
  4. D
    High levels of FSH and LH in uterus to stimulate endometrial thickening

Solution & Step-by-step Explanation

After implantation, the trophoblast cells of the embryo secrete Human Chorionic Gonadotropin (HCG). HCG maintains the corpus luteum, which in turn continues to secrete high levels of estrogen and progesterone to maintain the pregnancy and the endometrial lining. High FSH and LH are prevented by the negative feedback of progesterone.

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In a normal pregnant woman, the amount of total gonadotropin activity was assessed. The result expected was:
A
High level of circulating HCG to stimulate estrogen and progesterone synthesis
B
High level of circulating FSH and LH in the uterus to stimulate implantation of the embryo
C
High level of circulating HCG to stimulate endometrial thickening
D
High levels of FSH and LH in uterus to stimulate endometrial thickening

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