A person can expel all the air from the lungs.

Answer

To address the question, "A person can expel all the air from the lungs," we need to analyze the concept of lung volumes and capacities.

### Step-by-Step Solution:

1. **Understanding Lung Volumes**: The lungs have different volumes of air that can be measured. These include tidal volume, inspiratory reserve volume, expiratory reserve volume, and residual volume.

2. **Defining Residual Volume**: Residual volume is the amount of air that remains in the lungs after a person has expelled as much air as possible through forceful expiration. This volume cannot be voluntarily expelled.

3. **Quantifying Residual Volume**: The typical residual volume in a healthy adult is approximately 1200 mL. This means that even after a person exhales forcefully, there will still be about 1200 mL of air left in the lungs.

4. **Conclusion**: Since there is always a residual volume of air that cannot be expelled from the lungs, the statement "A person can expel all the air from the lungs" is false.

### Final Answer:
The statement is false because a person cannot expel all the air from the lungs due to the presence of residual volume.

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