A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is

Options

A. total lung capacity
B. tidal volume
C. vital capacity
D. inspiratory capacity

Answer

To solve the question regarding the volume of air a person breathes in by forced inspiration after a forced expiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Total Lung Capacity (TLC)**: This is the total volume of air the lungs can hold after maximum inhalation. It includes the vital capacity and the residual volume.
- **Tidal Volume (TV)**: This is the amount of air inhaled or exhaled during normal breathing. It is not related to forced inspiration or expiration.
- **Vital Capacity (VC)**: This is the maximum amount of air that can be exhaled after a maximum inhalation. It includes tidal volume, inspiratory reserve volume (IRV), and expiratory reserve volume (ERV).
- **Inspiratory Capacity (IC)**: This is the maximum volume of air that can be inspired after a normal tidal expiration. It is the sum of tidal volume and inspiratory reserve volume.

2. **Identifying the Scenario**:
- The question states that a person breathes in a volume of air by forced inspiration after having a forced expiration. This indicates that the person is using their maximum capacity to inhale after exhaling forcefully.

3. **Analyzing Forced Inspiration and Expiration**:
- **Forced Expiration**: This refers to using the expiratory reserve volume (ERV), which is the additional air that can be exhaled after a normal expiration.
- **Forced Inspiration**: This involves the inspiratory reserve volume (IRV), which is the additional air that can be inhaled after a normal inspiration.

4. **Calculating the Volume of Air Taken In**:
- The total volume of air taken in during forced inspiration after a forced expiration can be expressed as:
\[ \text{Volume of air} = \text{IRV} + \text{TV} + \text{ERV} \]
- This combination of volumes corresponds to the vital capacity (VC).

5. **Conclusion**:
- Since the question asks for the quantity of air taken in during forced inspiration after forced expiration, the correct answer is **Vital Capacity (VC)**.

### Final Answer:
The quantity of air taken in by forced inspiration after having a forced expiration is **Vital Capacity**.

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