During menstrual cycle, luteinizing hormone (LH) is secreted due to:
Correct answer: B. Decrease in FSH
- A. Decrease in Estrogen
- B. Decrease in FSH
- C. Increase in FSH
- D. Environmental effect
Explanation
This is the option marked correct in the official UHS answer key. The physiology worth carrying into the exam is that the LH surge is driven by rising oestrogen from the ripening follicle, which flips the pituitary from negative to positive feedback, and that FSH does fall in the mid follicular phase as inhibin from the growing follicle suppresses it. So the fall in FSH accompanies the surge rather than causing it, and no option here states the oestrogen rise directly.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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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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