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STD 12 - 2. human reproduction — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 2. human reproduction1 Mark
MCQ
Changes in $GnRH$ pulse frequency in femail is controlled by circulating levels of
  • A
    progesterone only
  • B
    progesterone and inhibin
  • ✓
    estrogen and progesterone
  • D
    estrogen and inhibin.
✓

Answer

Correct option: C.
estrogen and progesterone
c
(c) : $GnRH$ is secreted by the hypothalamus which stimulates the anterior lobe of pituitary gland to secrete luteinising hormone $(LH) $ and $FSH$. $FSH $ stimulates the growth of the ovarian follicles and stimulates the formation of estrogens. $LH$ stimulates the corpus luteum to secrete progesterone. Rising levels of progesterone and estrogen inhibits the release of $GnRH$, which in turn, inhibits the production of $FSH$ and $LH$.

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