About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH su

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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

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$\boxed{\rm {Primary follicles}}$

$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \downarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \leftarrow \,\boxed A$

$\boxed{\rm {Graafian follicle}}$

$\,\,\,\,\,\,\,\,\,\,\,\,\,\, \downarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \leftarrow \,\boxed B$

$\,\,\,\,\,\,\,\,\,\,\,\boxed{\rm {Ovum}}$

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$\boxed{\rm {Corpus leuteum}}$

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