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Breakdown of the endometrial lining lea...

Breakdown of the endometrial lining leading to oozing out of fluid from the vagina on the day28/29 occurs due to withdrawal of

A

Oestrogen

B

FSH

C

FSH-RH

D

Progesterone

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Menstrual Cycle:** - The menstrual cycle consists of various phases, including the follicular phase, ovulation, and the luteal phase. Each phase is regulated by different hormones. 2. **Identifying Key Events:** - Ovulation occurs around day 14 of the cycle, where the mature follicle (Graafian follicle) releases a secondary oocyte into the fallopian tube. 3. **Luteal Phase:** - After ovulation, the luteal phase begins. The remnants of the Graafian follicle transform into the corpus luteum, which is responsible for producing hormones, primarily progesterone. 4. **Role of Progesterone:** - Progesterone is crucial for maintaining the endometrial lining of the uterus. It prepares the endometrium for potential implantation of a fertilized egg. 5. **Withdrawal of Progesterone:** - If fertilization does not occur, the corpus luteum degenerates, leading to a decrease in progesterone levels. This withdrawal of progesterone is what causes the endometrial lining to break down. 6. **Resulting Menstrual Flow:** - The breakdown of the endometrial lining leads to the shedding of the lining, resulting in menstrual flow, which typically occurs around day 28 to 29 of the cycle. 7. **Conclusion:** - The hormone responsible for the breakdown of the endometrial lining and the resulting menstrual flow is progesterone. Therefore, the correct answer to the question is the withdrawal of progesterone. **Final Answer:** The breakdown of the endometrial lining leading to oozing out of fluid from the vagina on day 28/29 occurs due to the withdrawal of progesterone. ---
**Step-by-Step Solution:** 1. **Understanding the Menstrual Cycle:** - The menstrual cycle consists of various phases, including the follicular phase, ovulation, and the luteal phase. Each phase is regulated by different hormones. 2. **Identifying Key Events:** - Ovulation occurs around day 14 of the cycle, where the mature follicle (Graafian follicle) releases a secondary oocyte into the fallopian tube. ...
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