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2.Human Reproduction
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About which day in a normal human menstrual cycle does rapid secretion of $LH$ (popularly called $LH$ surge) normally occurs?
A
$14^{th}$ day
B
$20^{th}$ day
C
$5^{th}$ day
D
$11^{th}$ day
(AIPMT-2011)
Solution
(a) : Both $LH$ and $FSH$ attain a peak level in the middle of menstrual cycle (about $14^{th}$ day). Rapid secretion of $LH$ leading to its maximum level during the midcycle called $LH$ surge induces rupture of Graafian follicle and thereby the release of ovum (ovulation).
Standard 12
Biology
