Choose the incorrect match from the following.

Options

A. Inspiratory capacity = TV + IRV
B. Expiratory capacity = TV + ERV
C. Vital capacity = ERV + TV + IRV
D. Residual volume = TV + (VC - IRV)

Answer

To solve the question of identifying the incorrect match from the given options related to lung capacities, we will analyze each match step by step.

### Step-by-Step Solution:

1. **Understand Inspiratory Capacity**:
- Inspiratory Capacity (IC) is defined as the maximum volume of air that can be inhaled after a normal expiration.
- It is calculated as:
\[ \text{Inspiratory Capacity} = \text{Tidal Volume (TV)} + \text{Inspiratory Reserve Volume (IRV)} \]
- **Match**: Inspiratory Capacity = TV + IRV (This is correct).

2. **Understand Expiratory Capacity**:
- Expiratory Capacity (EC) is defined as the maximum volume of air that can be exhaled after a normal inspiration.
- It is calculated as:
\[ \text{Expiratory Capacity} = \text{Tidal Volume (TV)} + \text{Expiratory Reserve Volume (ERV)} \]
- **Match**: Expiratory Capacity = TV + ERV (This is correct).

3. **Understand Vital Capacity**:
- Vital Capacity (VC) is the total amount of air that can be exhaled after a maximum inhalation.
- It is calculated as:
\[ \text{Vital Capacity} = \text{Tidal Volume (TV)} + \text{Inspiratory Reserve Volume (IRV)} + \text{Expiratory Reserve Volume (ERV)} \]
- **Match**: Vital Capacity = TV + IRV + ERV (This is correct).

4. **Understand Residual Volume**:
- Residual Volume (RV) is the amount of air that remains in the lungs after a maximal exhalation.
- It is not calculated using the sum of other volumes like ERV. Instead, it is a distinct volume that cannot be exhaled.
- **Incorrect Match**: The statement claims that Residual Volume = ERV + RV, which is incorrect because RV is a separate volume that does not combine with ERV.

### Conclusion:
The incorrect match from the options provided is the last one regarding Residual Volume.

### Final Answer:
The incorrect match is: Residual Volume = ERV + RV.

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