What will be the additional volume of air that a person can expire by a forcible expiration?

Options

A. 500 mL
B. 1100 mL
C. 2300 mL
D. 3000 mL

Answer

To determine the additional volume of air that a person can expire by forcible expiration, we need to understand the relevant lung volumes involved in respiration. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Lung Volumes
- The total volume of air that can be involved in breathing is categorized into different volumes: Tidal Volume (TV), Inspiratory Reserve Volume (IRV), and Expiratory Reserve Volume (ERV).
- Forcible expiration primarily involves the Expiratory Reserve Volume (ERV).

### Step 2: Identify the Relevant Volumes
- **Tidal Volume (TV)**: This is the amount of air inhaled or exhaled during normal breathing. It is typically around 500 ml.
- **Inspiratory Reserve Volume (IRV)**: This is the additional amount of air that can be inhaled after a normal inhalation. It is usually around 2500 to 3000 ml.
- **Expiratory Reserve Volume (ERV)**: This is the additional amount of air that can be forcibly exhaled after a normal exhalation.

### Step 3: Calculate the Additional Volume
- The question specifically asks for the additional volume of air that can be expired by forcible expiration, which is represented by the Expiratory Reserve Volume (ERV).
- According to the information provided, the ERV is approximately 1100 ml.

### Step 4: Conclusion
- Therefore, the additional volume of air that a person can expire by a forcible expiration is **1100 ml**.

### Summary of the Solution
The additional volume of air that a person can expire by a forcible expiration is 1100 ml, which corresponds to the Expiratory Reserve Volume (ERV).

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