After the expiration of a normal tidal volume a person breathes in as much as air possible the volume of air inspired is the

Options

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

Answer

To solve the question, "After the expiration of a normal tidal volume, a person breathes in as much air as possible. The volume of air inspired is the?", we will analyze the options given and understand the relevant respiratory terms.

### Step-by-Step Solution:

1. **Understand Tidal Volume**:
- Tidal volume (TV) is the amount of air that is inhaled or exhaled during normal breathing. It is the volume of air exchanged in a single breath during quiet breathing.

2. **Identify the Scenario**:
- The question specifies that we are looking at the situation after a normal tidal volume expiration. This means the person has just exhaled the normal amount of air.

3. **Consider the Breathing Process**:
- After exhaling (expiration), the person takes a deep breath in (inspiration). The question asks for the volume of air that can be inhaled after this normal expiration.

4. **Define Key Terms**:
- **Vital Capacity (VC)**: The maximum amount of air a person can expel from the lungs after a maximum inhalation. This is not the answer since it relates to maximum expiration.
- **Inspiratory Capacity (IC)**: The maximum volume of air that can be inspired after a normal expiration. This is also not the answer since it refers to normal inspiration.
- **Inspiratory Reserve Volume (IRV)**: The additional volume of air that can be inhaled with a forcible effort after a normal inspiration. This is the volume we are looking for.
- **Total Lung Capacity (TLC)**: The total volume of air in the lungs after a maximum inhalation. This is not relevant to the question.

5. **Conclusion**:
- The volume of air inspired after a normal tidal volume expiration, when a person breathes in as much air as possible, is the **Inspiratory Reserve Volume (IRV)**.

### Final Answer:
The volume of air inspired is the **Inspiratory Reserve Volume (IRV)**.

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