Arrange the various respiratory volume in ascending order .

Options

A. Tidal Volume `rarr` Residual Volume `rarr` Expiratory Reserve Volume `rarr` Inspiratory Reserve Volume
B. Tidal Volume `rarr` Expiratory Reserve Volume `rarr` Residual Volume `rarr` Inspiratory Reserve Volume
C. Tidal Volume `rarr` Residual Volume `rarr` Inspiratory Reserve Volume `rarr` Expiratory Reserve Volume
D. Residual Volume `rarr` Tidal Volume `rarr` Inspiratory Reserve Volume `rarr` Expiratory Reserve Volume

Answer

To arrange the various respiratory volumes in ascending order, we first need to understand what each volume represents and their approximate values:

1. **Tidal Volume (TV)**: This is the volume of air inspired or expired during normal respiration. The average volume is approximately **500 ml**.

2. **Expiratory Reserve Volume (ERV)**: This is the additional volume of air that can be forcibly expired after normal expiration. The average volume is around **1000 ml to 1100 ml**.

3. **Residual Volume (RV)**: This is the volume of air remaining in the lungs after a forcible expiration. The average volume is about **1100 ml to 1200 ml**.

4. **Inspiratory Reserve Volume (IRV)**: This is the additional volume of air that can be forcibly inspired after normal inspiration. The average volume is around **2500 ml to 3000 ml**.

Now, we can summarize the average values of these respiratory volumes:
- Tidal Volume (TV): **500 ml**
- Expiratory Reserve Volume (ERV): **1000 ml to 1100 ml**
- Residual Volume (RV): **1100 ml to 1200 ml**
- Inspiratory Reserve Volume (IRV): **2500 ml to 3000 ml**

### Step-by-Step Arrangement:
1. **Identify the smallest volume**: Tidal Volume (TV) is **500 ml**.
2. **Next smallest volume**: Expiratory Reserve Volume (ERV) is approximately **1000 ml to 1100 ml**.
3. **Next in line**: Residual Volume (RV) is approximately **1100 ml to 1200 ml**.
4. **Largest volume**: Inspiratory Reserve Volume (IRV) is **2500 ml to 3000 ml**.

### Final Arrangement in Ascending Order:
1. Tidal Volume (TV) - **500 ml**
2. Expiratory Reserve Volume (ERV) - **1000 ml to 1100 ml**
3. Residual Volume (RV) - **1100 ml to 1200 ml**
4. Inspiratory Reserve Volume (IRV) - **2500 ml to 3000 ml**

Thus, the correct ascending order of respiratory volumes is:
**Tidal Volume < Expiratory Reserve Volume < Residual Volume < Inspiratory Reserve Volume**