A) The detection of human chorionic gonadotropin in the urine forms the basis for pregnancy tests.
B) The cyclic release of pituitary gonadotropins and ovarian steroids is continued.
C) The mammary gland tissue of the pregnant woman is stimulated to develop by placental hormones.
D) The corpus luteum of pregnancy maintains the uterus until the placenta is well established.
Correct Answer: B
Solution :
[b] The high levels of oestrogen and progesterone in the maternal circulation during pregnancy inhibit the cyclic release of pituitary gonadotropins and prevent the menstrual cycles. Pregnancy hormones include hCG, which maintains the corpus luteum of pregnancy and forms the basis for pregnancy diagnosis urine tests. Ovarian and placental oestrogen and progesterone, human placental lactogen, and pituitary prolactin stimulate development of the ducts and alveoli in the mammary glands.
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