The volume of air present in the lungs after forceful expiration is called as

Options

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

Answer

To solve the question, "The volume of air present in the lungs after forceful expiration is called as," we need to understand the different terms related to lung volumes. Here’s a step-by-step breakdown:

### Step 1: Understand Expiration
- Expiration is the process of breathing out air from the lungs. During this process, air is expelled from the lungs into the atmosphere.

### Step 2: Define Key Terms
- **Expiratory Reserve Volume (ERV)**: This is the additional amount of air that can be exhaled after a normal exhalation. It refers to the extra air that can be pushed out forcefully beyond the normal tidal volume.

- **Expiratory Capacity**: This is the total amount of air that can be exhaled after a deep inhalation, which includes both the tidal volume and the expiratory reserve volume.

- **Residual Volume (RV)**: This is the volume of air that remains in the lungs after a forceful expiration. This air cannot be expelled from the lungs and is always present to keep the alveoli open.

### Step 3: Analyze the Options
- Option A: Expiratory Reserve Volume - This is not the correct answer as it refers to the air that can be forcefully exhaled after a normal breath, not what remains after expiration.

- Option B: Expiratory Capacity - This is also incorrect as it refers to the total volume that can be exhaled after a deep breath, not the air left in the lungs.

- Option C: Residual Volume - This is the correct answer because it specifically refers to the air that remains in the lungs after a forceful expiration.

- Option D: Both A and B - This is incorrect since neither A nor B defines the volume of air left after forceful expiration.

### Conclusion
The correct answer to the question is **Option C: Residual Volume**.

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