In 28 day human ovarian cycle, ovulation occurs on
A
Day 1
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B
Day 5
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C
Day 14
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D
Day 28
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Solution
The correct option is C Day 14 The menstrual cycle starts with the menstrual phase. The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase and stimulates follicular development as well as secretion of estrogens by the growing follicles.
Both LH and FSH attain a peak level in the middle of the cycle (about 14th day). Rapid secretion of LH leading to its maximum level during the mid-cycle, called as LH surge induces rupture of Graafian follicle and thereby the release of an ovum (ovulation).
The ovulation (ovulatory phase) is followed by the luteal phase during which the remaining parts of the Graafian follicle transform as the corpus luteum.