Ovulation is triggered by a sharp rise in
Correct answer: B. luteinising hormone
- A. oestrogen alone
- B. luteinising hormone
- C. progesterone
- D. follicle stimulating hormone
Explanation
Rising oestrogen from the ripening follicle switches the pituitary from negative to positive feedback and produces a sudden LH surge, which ruptures the follicle within about a day. Oestrogen is the signal that causes the surge rather than the trigger itself, which is why it is the tempting choice. Progesterone rises only after ovulation, once the corpus luteum has formed.
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About Menstrual Cycle
The menstrual cycle covers the coordinated changes in the ovaries and uterus, including menstruation, follicular growth, ovulation and corpus luteum formation. It links follicle-stimulating hormone, luteinizing hormone, oestrogen and progesterone with endometrial changes, and distinguishes the ovarian cycle from the uterine cycle and the hormonal events of pregnancy.
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