In which days, the secretory phase will takes place?

Options

A. 5 to 13 days
B. 3 - 5 days
C. 15-29 days
D. Either (a) or (b)

Answer

**Step-by-Step Solution:**

1. **Understand the Menstrual Cycle Duration**: The menstrual cycle typically lasts about 28 to 29 days.

2. **Identify the Phases of the Menstrual Cycle**:
- **Menstrual Phase**: This occurs during the first 3 to 5 days of the cycle when menstruation happens.
- **Follicular Phase**: This phase lasts from day 6 to day 13, where follicles in the ovaries mature.
- **Ovulation**: This occurs around day 14, when an egg is released from the ovary.

3. **Determine the Secretory Phase**:
- The secretory phase follows ovulation. It occurs from day 15 to day 29 of the menstrual cycle.
- During this phase, if fertilization does not occur, the corpus luteum (the structure formed after ovulation) degenerates.

4. **Conclusion**: The secretory phase takes place from day 15 to day 29 of the menstrual cycle.

**Final Answer**: The secretory phase occurs from day 15 to day 29.

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