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2.Human Reproduction
medium
Changes in $GnRH$ pulse frequency in femail is controlled by circulating levels of
A
progesterone only
B
progesterone and inhibin
C
estrogen and progesterone
D
estrogen and inhibin.
(NEET-2016)
Solution
(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 $LH$.
Standard 12
Biology
