Menstrual flow is initiated by a decrease in blood concentration of which two hormones?
Correct answer: B. Estrogen and progesterone
- A. FSH and LH
- B. Estrogen and progesterone
- C. Progesterone and androgen
- D. FSH and estrogen
Explanation
Estrogen and progesterone are two key hormones produced by the ovaries during the menstrual cycle. Estrogen is primarily responsible for stimulating the growth of the uterine lining (endometrium) during the first half of the menstrual cycle. Progesterone is produced after ovulation and helps maintain the thickened uterine lining, preparing it for potential embryo implantation. However, if implantation does not occur, levels of estrogen and progesterone decline, leading to the shedding of the uterine lining, which initiates menstrual flow.
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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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