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, we will analyze each respiratory volume and capacity defined in the problem.

### Step-by-Step Solution:

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

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

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

4. **Understand Residual Volume (RV)**:
- Residual Volume is the amount of air that remains in the lungs after a maximal exhalation.
- The statement given in the problem is:
\[ \text{RV} = \text{Tidal Volume (TV)} + \text{Vital Capacity (VC)} - \text{Inspiratory Reserve Volume (IRV)} \]
- This equation is incorrect because the Residual Volume cannot be derived from the Tidal Volume and Vital Capacity in this manner. Instead, Residual Volume is a separate measurement that cannot be calculated using the other volumes in this way.

### Conclusion:
The incorrect match from the options provided is the one related to Residual Volume.