In a human female , if the duration of her menstrual cycle is of 34 days . What is the duration of the luteal phase and at what day ovulation occurs in this woman ?

Options

A. 14 days , 20th day
B. 20 days , 14th day
C. 17 days , 17th day
D. 16 days , 18th day

Answer

To solve the problem, we need to understand the phases of the menstrual cycle and how they relate to the total cycle duration.

### Step-by-Step Solution:

1. **Understanding the Menstrual Cycle**:
The menstrual cycle is typically divided into several phases: the menstrual phase, the follicular phase, ovulation, and the luteal phase. The average cycle lasts about 28 days, but it can vary from woman to woman.

2. **Identifying the Luteal Phase**:
The luteal phase is the phase that occurs after ovulation and lasts until the start of the next menstrual period. The luteal phase typically lasts about 14 days, regardless of the length of the menstrual cycle.

3. **Calculating Ovulation Day**:
To find out when ovulation occurs, we can subtract the duration of the luteal phase from the total length of the menstrual cycle.
- Given the total cycle length is 34 days.
- The luteal phase is approximately 14 days.
- Therefore, ovulation occurs at:
\[ \text{Ovulation Day} = \text{Total Cycle Length} - \text{Luteal Phase Length} = 34 - 14 = 20 \]
This means ovulation occurs on the 20th day of the cycle.

4. **Final Answers**:
- The duration of the luteal phase is **14 days**.
- Ovulation occurs on **day 20** of the cycle.

### Summary:
- **Luteal Phase Duration**: 14 days
- **Ovulation Day**: Day 20