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 forcibly expired after taking the deepest possible inspiration.
- It can also be described as the total volume of air that can be inspired and expired to the maximum level.

2. **Components of Vital Capacity:**
- Vital capacity is the sum of three different lung volumes:
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