The volume of air remaining in the lungs even after a forcible expiration is

Options

A. Expiratory reserve volume
B. Expiratory capacity
C. Residual volume
D. Both (1) & (2)

Answer

To solve the question regarding the volume of air remaining in the lungs after a forcible expiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Lung Volumes**:
- The lungs have different volumes of air that can be measured. These include tidal volume, inspiratory reserve volume, expiratory reserve volume, residual volume, and others.

2. **Identifying Key Terms**:
- **Expiratory Reserve Volume (ERV)**: This is the amount of air that can be forcibly exhaled after the end of a normal expiration.
- **Expiratory Capacity (EC)**: This is the maximum volume of air that can be exhaled after a normal expiration, which includes both tidal volume and expiratory reserve volume.
- **Residual Volume (RV)**: This is the volume of air that remains in the lungs after a forcible expiration. It cannot be expelled from the lungs.

3. **Analyzing the Options**:
- The question asks for the volume of air remaining in the lungs after a forcible expiration.
- ERV refers to the air that can still be exhaled, not what remains.
- EC is the total air that can be expelled after a normal breath, not what remains after forceful expiration.
- RV specifically refers to the air that remains in the lungs after all possible expiration has occurred.

4. **Conclusion**:
- The correct answer is **Residual Volume (RV)**, as it is defined as the volume of air that remains in the lungs after a forcible expiration.

### Final Answer:
The volume of air remaining in the lungs even after a forcible expiration is **Residual Volume (RV)**.

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