What changes take place during days 16-28 of the menstrual cycle?
Correct answer: A. Uterine wall is prepared for implantation of embryo
- A. Uterine wall is prepared for implantation of embryo
- B. Menstrual flow
- C. Levels of estrogen fall
- D. Ovulation
Explanation
The time duration of days 16-28 is known as the luteal phase. During this time, the uterine wall is prepared for the implantation of the embryo under the influence of progesterone secreted by the corpus luteum. If pregnancy is established, the corpus luteum continues secreting progesterone under the effect of human chorionic gonadotropin. If the embryo is not implanted, the corpus luteum degenerates, and all hormone levels fall resulting in the onset of the menstrual period.
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About Reproduction
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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