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Explain briefly the following: Residu...

Explain briefly the following:
Residual volume

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**Step-by-Step Solution:** 1. **Definition of Residual Volume**: Residual volume (RV) is defined as the amount of air that remains in the lungs after a person has exhaled as forcefully as possible. 2. **Importance of Residual Volume**: This volume is crucial because it prevents the alveoli (the tiny air sacs in the lungs) from collapsing. It ensures that there is always some air in the lungs, which facilitates gas exchange even when a person is not actively breathing. 3. **Characteristics of Residual Volume**: - Residual volume cannot be voluntarily expelled from the lungs. ...
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