The extra volume of air that can be inspired forcibly after normal inspiration is

Options

A. Tidal volume
B. Inspiratory Reserve Volume
C. Vital capacity
D. Inspiratory Capacity

Answer

To solve the question, "The extra volume of air that can be inspired forcibly after normal inspiration is?", we need to understand the definitions of the different lung volumes mentioned in the options. Here’s a step-by-step breakdown:

### Step 1: Understand Tidal Volume
- **Definition**: Tidal volume is the amount of air that is inhaled or exhaled during normal breathing.
- **Conclusion**: This does not refer to the extra volume after normal inspiration.

### Step 2: Understand Inspiratory Reserve Volume
- **Definition**: Inspiratory reserve volume (IRV) is the additional amount of air that can be inhaled after a normal inhalation.
- **Conclusion**: This is indeed the extra volume that can be inspired after normal inspiration.

### Step 3: Understand Vital Capacity
- **Definition**: Vital capacity is the total amount of air that can be exhaled after a maximum inhalation. It includes tidal volume, inspiratory reserve volume, and expiratory reserve volume.
- **Conclusion**: This does not specifically refer to the extra volume after normal inspiration.

### Step 4: Understand Inspiratory Capacity
- **Definition**: Inspiratory capacity is the maximum amount of air that can be inhaled after a normal expiration, which is the sum of tidal volume and inspiratory reserve volume.
- **Conclusion**: While it involves additional air intake, it is not specifically the extra volume after normal inspiration.

### Final Answer
Based on the definitions and understanding of the terms, the extra volume of air that can be inspired forcibly after normal inspiration is **Inspiratory Reserve Volume (IRV)**.