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22. After 12 weeks of gestation the principal source of estrogen and progesterone to a human fetusis the:A. ovarian follicle.B. corpus luteum.C. placenta.D. anterior pituitary.E. posterior pituitary.

Question

  1. After 12 weeks of gestation the principal source of estrogen and progesterone to a human fetusis the:A. ovarian follicle.B. corpus luteum.C. placenta.D. anterior pituitary.E. posterior pituitary.
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Solution

The answer is C. Placenta.

Here's the step by step explanation:

  1. During the early stages of pregnancy, the corpus luteum (option B) is responsible for the production of progesterone, which is essential for the maintenance of the pregnancy until the placenta has developed enough to take over this function.

  2. The corpus luteum continues to secrete progesterone until about the 10th to 12th week of pregnancy, at which point the placenta has developed enough to produce significant levels of this hormone.

  3. After the 12th week of gestation, the placenta (option C) becomes the principal source of both estrogen and progesterone. These hormones are crucial for maintaining the pregnancy and preparing the body for childbirth.

  4. The ovarian follicle (option A) is not the main source of these hormones after the 12th week of gestation. The anterior pituitary (option D) and posterior pituitary (option E) do not produce significant amounts of estrogen or progesterone at any point during pregnancy.

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