Vital capacity is

Options

A. TR + IRV
B. TV + ERV
C. RR+ ERV
D. TV+ IRV + ERV

Answer

**Step-by-Step Solution:**

1. **Definition of Vital Capacity**:
- Vital Capacity (VC) is defined as the maximum amount of air a person can expel from the lungs after taking the deepest possible breath (maximum inhalation).

2. **Components of Vital Capacity**:
- Vital Capacity is the sum of three different lung volumes:
- 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.
- Therefore, the formula for Vital Capacity is:
\[ VC = TV + IRV + ERV \]

3. **Evaluating Options**:
- **Option 1**: TR + IRV - This option is incorrect because it does not include all the necessary components of Vital Capacity.
- **Option 2**: TV + IRV - This option is also incorrect because it omits the Expiratory Reserve Volume (ERV).
- **Option 3**: RR + ERV - This option is incorrect as it does not include Tidal Volume (TV) or Inspiratory Reserve Volume (IRV).
- **Option 4**: TV + IRV + ERV - This option is correct as it includes all components that make up Vital Capacity.

4. **Conclusion**:
- The correct answer is Option 4: TV + IRV + ERV. The normal Vital Capacity for an adult male is typically between 3 to 5 liters.