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About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH surge) normally occur?
A
5th day
B
11th day
C
14th day
D
20th day
Detailed Solution
During the follicular phase the secretion of gonadotropins (LH and FSH) increases gradually and stimulates follicular development and oestrogen secretion.
Both LH and FSH attain a peak in the middle of the cycle, i.e., about the 14th day of a 28-day cycle.
This rapid secretion of LH leading to its maximum level is called the LH surge.
The LH surge induces rupture of the Graafian follicle and release of the ovum (ovulation).
Hence the LH surge normally occurs about the 14th day.
Both LH and FSH attain a peak in the middle of the cycle, i.e., about the 14th day of a 28-day cycle.
This rapid secretion of LH leading to its maximum level is called the LH surge.
The LH surge induces rupture of the Graafian follicle and release of the ovum (ovulation).
Hence the LH surge normally occurs about the 14th day.