An additional volume of air, a person can inspire by
a forceful inspiration is known as

Options

A. Inspiratory capacity
B. Expiratory capacity
C. Expiratory reserve volume
D. Inspiratory reserve volume

Answer

To solve the question "An additional volume of air a person can inspire by a forceful inspiration is known as," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a specific term that describes the additional volume of air a person can inhale (inspire) beyond the normal breathing capacity during a forceful inspiration.

2. **Identify Relevant Terms**:
- **Tidal Volume (TV)**: The amount of air inhaled or exhaled during normal breathing.
- **Inspiratory Reserve Volume (IRV)**: The additional volume of air that can be inhaled after a normal inhalation.
- **Expiratory Reserve Volume (ERV)**: The additional volume of air that can be exhaled after a normal exhalation.
- **Inspiratory Capacity (IC)**: The total volume of air a person can inhale after a normal expiration.

3. **Analyze the Options**:
- The question specifically refers to an "additional volume" that can be inspired, which means we are looking for a term that indicates extra air taken in after a normal breath.
- The **Inspiratory Reserve Volume (IRV)** fits this description perfectly, as it represents the extra air that can be inhaled forcefully after a normal inhalation.

4. **Conclusion**: Based on the definitions and analysis, the correct answer is **Inspiratory Reserve Volume (IRV)**.

### Final Answer:
The additional volume of air a person can inspire by forceful inspiration is known as **Inspiratory Reserve Volume (IRV)**.

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