Define vital capacity. What is its significance?

Explanation

### Step-by-Step Solution:

1. **Definition of Vital Capacity**:
- Vital capacity is defined as the maximum volume of air that a person can inhale after a forceful expiration. It represents the total amount of air that can be exchanged in the lungs during one complete breath cycle.

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