Volume of air breathed in and out during normal breathing is called

Options

A. tidal volume
B. vital capacity
C. residual volume
D. inspiratiory reserve volume

Answer

To solve the question "Volume of air breathed in and out during normal breathing is called," we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking for the specific term that describes the volume of air that is inhaled and exhaled during normal, relaxed breathing.

2. **Reviewing the Options**:
- **Tidal Volume**: This term refers to the amount of air that is inhaled or exhaled during a normal breath. It is typically around 500 ml.
- **Vital Capacity**: This is the maximum amount of air a person can inhale or exhale after a maximum inhalation. It is not specific to normal breathing.
- **Residual Volume**: This is the volume of air remaining in the lungs after a forceful exhalation. It does not pertain to the volume of air exchanged during normal breathing.
- **Inspiratory Reserve Volume**: This is the amount of air that can be inhaled forcibly after a normal inhalation, which is also not related to normal breathing.

3. **Identifying the Correct Answer**: From the definitions:
- The only term that specifically describes the volume of air exchanged during normal breathing is **Tidal Volume**.

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

### Final Answer:
The volume of air breathed in and out during normal breathing is called **Tidal Volume**.

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