Hormones Triggering Ovulation

Steps:

• Recall FSH stimulates ovarian follicle development, preparing for ovulation.
• Note LH surge directly triggers the release of the egg from the follicle.
• Confirm estrogen promotes follicle growth but does not cause ovulation itself.
• Verify progesterone maintains the uterine lining post-ovulation, not required for the event.

Why D is correct:

• FSH and LH are essential per the menstrual cycle mechanism: FSH matures follicles, and LH surge induces ovulation.

Why the others are wrong:

• A incorrectly includes progesterone, which acts after ovulation.
• B omits LH and wrongly requires both estrogen and progesterone.
• C excludes LH, which is critical for the ovulatory surge.

Final answer: D