Which one has the lowest value

Options

A. Tidal volume
B. Vital capacity
C. Inspiratory reserves volume
D. Expiratory reserve volume

Answer

To determine which of the given options has the lowest value, we will analyze each respiratory volume mentioned in the question.

### Step-by-Step Solution:

1. **Understand Tidal Volume (TV)**:
- Tidal volume is the amount of air that moves in or out of the lungs with each respiratory cycle.
- For an adult healthy male, the average tidal volume is about **500 ml**, while for females, it is around **400 ml**.

2. **Understand Vital Capacity (VC)**:
- Vital capacity is the maximum volume of air that can be exhaled after a maximum inhalation.
- It is calculated by adding the inspiratory reserve volume (IRV), tidal volume (TV), and expiratory reserve volume (ERV).
- The average vital capacity ranges from **3400 ml to 4800 ml** depending on various factors like age, sex, and height.

3. **Understand Inspiratory Reserve Volume (IRV)**:
- Inspiratory reserve volume is the additional volume of air that can be inhaled after a normal inhalation.
- The average IRV is approximately **2500 ml to 3000 ml**.

4. **Understand Expiratory Reserve Volume (ERV)**:
- Expiratory reserve volume is the additional volume of air that can be exhaled after a normal exhalation.
- The average ERV is around **1000 ml to 1100 ml**.

5. **Compare the Values**:
- Tidal Volume: **500 ml**
- Vital Capacity: **3400 ml to 4800 ml**
- Inspiratory Reserve Volume: **2500 ml to 3000 ml**
- Expiratory Reserve Volume: **1000 ml to 1100 ml**

6. **Conclusion**:
- Among all the options, tidal volume has the lowest value at **500 ml**.

### Final Answer:
The option with the lowest value is **Tidal Volume (TV)**.