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 byke 6x;:c s6qb5vt/n og an embryo early in pregnancy in order t6yll :vyn;aj9(4 doq to stimulate the ovary to sltv;j y:6nyoq9l(d 4aecrete 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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