Define vital capacity. What is its significance?

Explanation

**Step-by-Step Solution:**

1. **Definition of Vital Capacity:**
- Vital capacity is defined as the maximum amount of air that can be expelled from the lungs after a maximum inhalation. It is the total volume of air that can be moved in and out of the lungs with a single breath cycle, encompassing the tidal volume, inspiratory reserve volume, and expiratory reserve volume.

2. **Components of Vital Capacity:**
- Vital capacity consists of three main components:
- **Tidal Volume (TV):** The amount of air inhaled or exhaled during normal breathing.
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