Arrange the following in an ascending order of volume
1 expiratory reserve volume
2 inspiratory capacity
3 tidal volume
4 residual volume

Options

A. `(iii) lt (i) lt (iv) lt (ii)`
B. `(iv) lt (i) lt (iii) lt (ii)`
C. `(iv) lt (ii) lt (i) lt (iii)`
D. `(iii) lt (iv) lt (ii) lt (i)`

Answer

To arrange the given respiratory volumes in ascending order, we first need to understand the definitions and approximate values of each volume:

1. **Tidal Volume (TV)**: This is the amount of air inhaled or exhaled in a normal breath. The average value is approximately **500 ml**.

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

3. **Residual Volume (RV)**: This is the volume of air that remains in the lungs after a maximal exhalation. The average value is approximately **1100 to 1200 ml**.

4. **Inspiratory Capacity (IC)**: This is the total volume of air that can be inhaled after a normal expiration. It is the sum of the tidal volume and the inspiratory reserve volume. The inspiratory capacity is approximately **2500 to 3000 ml**.

Now, let's summarize the approximate values:
- Tidal Volume (TV): **500 ml**
- Expiratory Reserve Volume (ERV): **1000 to 1100 ml**
- Residual Volume (RV): **1100 to 1200 ml**
- Inspiratory Capacity (IC): **2500 to 3000 ml**

Now, we can arrange these volumes in ascending order:
1. **Tidal Volume (500 ml)**
2. **Expiratory Reserve Volume (1000 to 1100 ml)**
3. **Residual Volume (1100 to 1200 ml)**
4. **Inspiratory Capacity (2500 to 3000 ml)**

Thus, the ascending order of the volumes is:
1. Tidal Volume (TV)
2. Expiratory Reserve Volume (ERV)
3. Residual Volume (RV)
4. Inspiratory Capacity (IC)

### Final Answer:
**Ascending order of volume: Tidal Volume < Expiratory Reserve Volume < Residual Volume < Inspiratory Capacity**

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