Breakdown of the endometrium during menstruation is due to:
Correct answer: B. Decrease in the level of progesterone
- A. Increase in the level of LH
- B. Decrease in the level of progesterone
- C. Increase in the level of FSH
- D. Increase in the level of estrogen
Explanation
If fertilization doesn't occur, the corpus luteum starts to degenerate, leading to a decrease in progesterone production. This decrease in progesterone levels triggers a breakdown of the endometrial lining. Without the support of progesterone, the blood vessels in the endometrium constrict, leading to reduced blood flow to the tissue. This causes the superficial layers of the endometrial lining to slough off, resulting in menstruation. So option B is correct.
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Human reproduction covers the male and female reproductive organs, gamete formation, fertilization, implantation and hormonal regulation. The menstrual cycle includes ovarian and uterine changes controlled by pituitary and ovarian hormones, while sexually transmitted diseases are studied through their causes, transmission, symptoms, prevention and effects on fertility.
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