Vital capacity does not include

Options

A. Tidal volume
B. Inspiratory reserve volume
C. Residual volume
D. Expiratory reserve volume

Answer

To solve the question "Vital capacity does not include," we need to understand the components that make up vital capacity and identify which option is not part of it.

### Step-by-Step Solution:

1. **Understand Vital Capacity (VC)**:
- Vital capacity is defined as the maximum amount of air that can be forcefully exhaled from the lungs after a deep inhalation.

2. **Components of Vital Capacity**:
- The formula for vital capacity is:
\[ \text{Vital Capacity (VC)} = \text{Inspiratory Reserve Volume (IRV)} + \text{Tidal Volume (TV)} + \text{Expiratory Reserve Volume (ERV)} \]
- Here,
- **Inspiratory Reserve Volume (IRV)**: The amount of air that can be inhaled after a normal inhalation.
- **Tidal Volume (TV)**: The amount of air inhaled or exhaled during normal breathing.
- **Expiratory Reserve Volume (ERV)**: The amount of air that can be forcefully exhaled after a normal exhalation.

3. **Identify the Residual Volume**:
- **Residual Volume (RV)**: This is the amount of air that remains in the lungs after a forceful exhalation. It is not included in the vital capacity because it cannot be expelled from the lungs.

4. **Analyze the Options**:
- Option A: Tidal Volume - Included in VC.
- Option B: Inspiratory Reserve Volume - Included in VC.
- Option C: Residual Volume - Not included in VC.
- Option D: Expiratory Reserve Volume - Included in VC.

5. **Conclusion**:
- The correct answer is **Option C: Residual Volume**, as it is not included in the vital capacity.

### Final Answer:
Vital capacity does not include **Residual Volume** (Option C).