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

Options

A. EC
B. RV
C. ERV
D. IRV

Answer

To solve the question regarding the volume of air remaining in the lungs even after a forcible expiration, we will analyze the options provided and determine which one correctly describes this volume.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the volume of air that remains in the lungs after a forcible expiration. This is a key point as it specifies "after a forcible expiration."

2. **Analyzing the Options**:
- **Option A: EC (Expiratory Capacity)**: This refers to the total volume of air that can be expelled from the lungs after a maximal inhalation. Since the question is about the air remaining after expiration, this is not the correct answer.

- **Option B: RV (Residual Volume)**: This is defined as the volume of air that remains in the lungs after a forcible expiration. This matches the requirement of the question, as it specifically refers to the air left in the lungs post-expiration.

- **Option C: ERV (Expiratory Reserve Volume)**: This is the additional amount of air that can be forcibly exhaled after the expiration of a normal tidal volume. This does not refer to the air remaining in the lungs after expiration, so it is not the correct answer.

- **Option D: IRV (Inspiratory Reserve Volume)**: This is the additional amount of air that can be inhaled after a normal inhalation. Again, this does not relate to the volume remaining after expiration.

3. **Conclusion**: Based on the analysis, the correct answer is **RV (Residual Volume)**, as it specifically refers to the 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)**.