In which phase of the human female menstrual cycle, endometrium prepares for the implantation of embryo?
Correct answer: C. Secretory phase
- A. Proliferative phase
- B. Menstrual phase
- C. Secretory phase
- D. Ovulation phase
Explanation
From day 14 to day 28 of the menstrual cycle (secretory phase) Progesterone thickens endometrium in preparation for possible fertilization and subsequent implantation.During the secretory phase, which occurs after ovulation, the levels of progesterone rise. Progesterone stimulates the thickening and development of the endometrium, the lining of the uterus. The endometrium becomes rich in blood vessels and glandular secretions, preparing it for the potential implantation of a fertilized embryo.The proliferative phase occurs earlier in the menstrual cycle, prior to ovulation. During this phase, the levels of estrogen rise.The ovulatory phase is the phase in which ovulation occurs. It involves the release of a mature egg (ovum) from the ovary.Secretory phase, which occurs after ovulation, the levels of progesterone rise. Progesterone stimulates the thickening and development of the endometrium, the lining of the uterus. The endometrium becomes rich in blood vessels and glandular secretions, preparing it for the potential implantation of a fertilized embryo.If fertilization and implantation do not occur, hormone levels decrease towards the end of the secretory phase. This leads to the shedding of the endometrium during the subsequent menstrual phase, which marks the beginning of a new menstrual cycle.
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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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