During menstrual cycle, progesterone attains a peak level around

Options

A. One week prior to menses
B. Two weeks prior to menses
C. One week after menses
D. Nine hours after LH surge

Answer

**Step-by-Step Solution:**

1. **Understanding the Menstrual Cycle**: The menstrual cycle typically lasts about 28 days. It includes several phases: the follicular phase, ovulation, the luteal phase, and menstruation.

2. **Identifying Key Events**:
- Ovulation occurs approximately in the middle of the cycle, around day 14.
- After ovulation, the ruptured follicle transforms into the corpus luteum.

3. **Role of Corpus Luteum**: The corpus luteum produces progesterone, which is crucial for preparing the endometrium (the lining of the uterus) for a potential pregnancy.

4. **Timing of Progesterone Release**: Progesterone levels rise after ovulation due to the activity of the corpus luteum. This hormone peaks to maintain the uterine lining for a fertilized egg.

5. **Determining the Peak Level of Progesterone**:
- The corpus luteum is formed around day 21 of the menstrual cycle.
- Since menstruation (menses) typically occurs around day 28, the peak level of progesterone is reached approximately one week prior to menses, which would be around day 21.

6. **Conclusion**: Therefore, during the menstrual cycle, progesterone attains a peak level around one week prior to the menses.

**Final Answer**: During the menstrual cycle, progesterone attains a peak level around **1 week prior to the menses**.

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