About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occur?
- 11th day
- 14th day
- 20th day
- 5th day
Answer
(2) 14th day
Solution
As per NCERT, both LH and FSH attain a peak level in the middle of the cycle (about the 14th day of a 28-day cycle).
⇒ This rapid secretion of LH (LH surge) induces rupture of the Graafian follicle and release of the ovum (ovulation).
Answer: (2)