本题目来源于试卷: Continuity and Change D.7 Reproduction，类别为 IB生物学
[单选题]
Which hormone is released by an embryo early in pregnanc/k (-gg 6gyekunak:/uk a06a ey in order r*jsen 9iyxr+33kl o ,awrz*i9h9m* gto stimulate ho93 iraiwzrs x,j39m*ye l *gnk9*r+the ovary to secrete progesterone?
A. LH
B. Oestradiol
C. hCG
D. FSH
参考答案: C
本题详细解析:
Early in pregnancy, a human embryo secretes the hormone hCG, human chorionic gonadotrophin. This hormone maintains the corpus luteum in the ovary so that it secretes progesterone, which helps prepare the lining of the uterus for the implantation of the embryo. LH (Choice A) and FSH (Choice D) are released by the pituitary gland, not the embryo. Oestradiol (Choice B) is released by the ovaries, not the embryo.
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