Choose the incorrect match in the following.

Options

A. Inspiratory capacity = IRV + TV
B. Functional residual capacity = RV + ERV
C. Total lung capacity = VC - TV
D. Vital capacity = ERV + TV + IRV

Answer

To solve the question of identifying the incorrect match from the given options, we will analyze each term and its corresponding definition 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 the sum of Tidal Volume (TV) and Inspiratory Reserve Volume (IRV).
- **Match**: Inspiratory Capacity = Tidal Volume + Inspiratory Reserve Volume (Correct).

2. **Understand Functional Residual Capacity**:
- Functional Residual Capacity (FRC) is the volume of air remaining in the lungs after a normal expiration.
- It is the sum of Expiratory Reserve Volume (ERV) and Residual Volume (RV).
- **Match**: Functional Residual Capacity = Expiratory Reserve Volume + Residual Volume (Correct).

3. **Understand Total Lung Capacity**:
- Total Lung Capacity (TLC) is the total volume of air that the lungs can hold.
- It is the sum of Tidal Volume (TV), Inspiratory Reserve Volume (IRV), Expiratory Reserve Volume (ERV), and Residual Volume (RV).
- The formula for Total Lung Capacity is: TLC = TV + IRV + ERV + RV.
- The statement in the question mentions "Vital Capacity minus Tidal Volume" which does not correctly represent Total Lung Capacity.
- **Match**: Total Lung Capacity ≠ Vital Capacity - Tidal Volume (Incorrect).

4. **Conclusion**:
- Based on the analysis, the incorrect match is related to Total Lung Capacity, which was incorrectly described as "Vital Capacity minus Tidal Volume". Therefore, the answer is option number 3.

### Final Answer:
The incorrect match is option number 3.

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