Select the incorrect match w.r.t pulmonary capacities and volumes.

Options

A. TV=IC-IRV
B. FRC=IRV+RV
C. EC=ERV+TV
D. VC=IRV+TV+ERV

Answer

To solve the question regarding the incorrect match with respect to pulmonary capacities and volumes, let's break down the information step by step.

### Step 1: Understand the Definitions
- **Tidal Volume (TV)**: The amount of air inhaled or exhaled during normal breathing.
- **Inspiratory Reserve Volume (IRV)**: The additional air that can be inhaled after a normal inhalation.
- **Expiratory Reserve Volume (ERV)**: The additional air that can be exhaled after a normal exhalation.
- **Residual Volume (RV)**: The amount of air remaining in the lungs after a forced exhalation.
- **Inspiratory Capacity (IC)**: The maximum amount of air that can be inhaled after a normal expiration, calculated as TV + IRV.
- **Functional Residual Capacity (FRC)**: The volume of air remaining in the lungs after a normal expiration, calculated as ERV + RV.
- **Expiratory Capacity (EC)**: The maximum amount of air that can be exhaled after a normal inhalation, calculated as ERV + TV.
- **Vital Capacity (VC)**: The total amount of air that can be exhaled after a maximum inhalation, calculated as IRV + TV + ERV.

### Step 2: Analyze Each Option
1. **TV = IC - IRV**:
- This is correct because IC (Inspiratory Capacity) is the sum of TV and IRV. Rearranging gives TV = IC - IRV.

2. **FRC = RV + IRV**:
- This is incorrect. FRC is actually calculated as ERV + RV, not RV + IRV.

3. **EC = ERV + TV**:
- This is correct as EC (Expiratory Capacity) is the sum of ERV and TV.

4. **VC = IRV + TV + ERV**:
- This is also correct as VC (Vital Capacity) is defined as the sum of IRV, TV, and ERV.

### Step 3: Identify the Incorrect Match
From the analysis, the only incorrect match is:
- **FRC = RV + IRV** (This is incorrect; it should be FRC = ERV + RV).

### Conclusion
The incorrect match with respect to pulmonary capacities and volumes is:
**FRC = RV + IRV**.

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