What is vital capacity in regard to breathing ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Vital Capacity**: Vital capacity refers to the maximum amount of air that can be exhaled after taking the deepest possible breath. It is an important measure in understanding lung function and respiratory health.

2. **Components of Vital Capacity**: Vital capacity is composed of three main components:
- **Tidal Volume (TV)**: The amount of air inhaled or exhaled during normal breathing.
- **Inspiratory Reserve Volume (IRV)**: The additional amount of air that can be inhaled after a normal inhalation.
- **Expiratory Reserve Volume (ERV)**: The additional amount of air that can be exhaled after a normal exhalation.
...