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Q.

Which of the following correctly describes the levels of ovarian hormones at the time of LH surge in a woman?

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a

High levels of oestrogen and progesterone

b

High levels of oestrogen and low levels of progesterone

c

Low levels of oestrogen and progesterone

d

High levels of progesterone and low levels of oestrogen

answer is B.

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Detailed Solution

The preovulatory surges of GnRH and LH are activated by increased concentrations of circulating estrogen and low progesteron. The fully grown Graafian follicle secretes high estrogen and low progesteron just before ovulation.Progesteron levels rise after ovulation due to formation of corpus luteum.
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