 In a typical 28-day menstrual cycle, ovulation is triggered by:
AA peak in FSH alone on day 14
BA surge of LH (LH surge) around mid-cycle (day ~14) inducing rupture of the Graafian follicle
CA peak in progesterone on day 14
DWithdrawal of estrogen on day 14
Answer & Solution
Correct answer: B. A surge of LH (LH surge) around mid-cycle (day ~14) inducing rupture of the Graafian follicle
Both LH and FSH peak around mid-cycle, but the **rapid LH surge** specifically triggers rupture of the Graafian follicle → ovulation. (FSH supports follicular growth; LH 'pulls the trigger'.)
Related questions
The fertilised egg, the zygote, gets implanted in the:Where are mature sperm produced in the human male?Colostrum (the first milk after childbirth) is rich in:The hormone that drives uterine contractions during childbirth (parturition) is:Human pregnancy lasts approximately:The hormone HCG (Human Chorionic Gonadotropin) that is detected by pregnancy tests is prodThe LH SURGE triggers which key event in the menstrual cycle?The average length of the human menstrual cycle is: