What triggers ovulation according to the material?

What triggers ovulation according to the material?

• A. LH surge
• B. Progesterone rise
• C. Estrogen surge that hits a peak
• D. FSH rise

Answer: (C)

The trigger is the estrogen surge that reaches a peak. As the follicle grows, it produces more estrogen. When estrogen levels rise high enough to reach a peak, they switch the system from negative to positive feedback on thebrain–pituitary axis, driving a rapid LH surge. That LH surge is what actually spurs ovulation—the release of the oocyte from the dominant follicle—while estrogen’s peak signals this event. After ovulation, the corpus luteum forms under LH influence and progesterone rises to prepare the uterus. So, the peak estrogen rise initiates the sequence that leads to ovulation, with the LH surge acting as the immediate trigger.

The trigger is the estrogen surge that reaches a peak. As the follicle grows, it produces more estrogen. When estrogen levels rise high enough to reach a peak, they switch the system from negative to positive feedback on thebrain–pituitary axis, driving a rapid LH surge. That LH surge is what actually spurs ovulation—the release of the oocyte from the dominant follicle—while estrogen’s peak signals this event. After ovulation, the corpus luteum forms under LH influence and progesterone rises to prepare the uterus. So, the peak estrogen rise initiates the sequence that leads to ovulation, with the LH surge acting as the immediate trigger.