Volume of air either inspired or expired during normal respiration is

Options

A. Inspiratory reserve volume
B. Tidal volume
C. Inspiratory capacity
D. Vital capacity

Answer

To solve the question regarding the volume of air either inspired or expired during normal respiration, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the volume of air that is either inhaled (inspired) or exhaled (expired) during normal breathing.

2. **Identify the Options**: The options given are:
- Inspiratory Reserve Volume
- Tidal Volume
- Inspiratory Capacity
- Vital Capacity

3. **Define Each Term**:
- **Inspiratory Reserve Volume (IRV)**: This is the additional volume of air that can be inhaled after a normal inhalation.
- **Tidal Volume (TV)**: This is the volume of air that is inhaled or exhaled during normal breathing. It represents the amount of air exchanged in one cycle of breathing.
- **Inspiratory Capacity (IC)**: This is the maximum volume of air that can be inhaled after a normal expiration, which includes tidal volume and inspiratory reserve volume.
- **Vital Capacity (VC)**: This is the total volume of air that can be exhaled after a maximum inhalation, which includes tidal volume, inspiratory reserve volume, and expiratory reserve volume.

4. **Identify the Correct Answer**: Among the definitions, the Tidal Volume is specifically the volume of air exchanged during normal respiration without any extra effort. In a healthy adult, this is approximately 500 ml.

5. **Conclusion**: Therefore, the correct answer to the question is **Tidal Volume**.

### Final Answer:
The volume of air either inspired or expired during normal respiration is **Tidal Volume**.

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