Go thruogh the following values
(i) residual volume -1200 ml
(ii) vital capacity -5.5 to 6.5 litres
(iii) expiratory reserve -1100ml
(iv) minut e respiratory volume -6000 to 8000 ml which of these are correct ?

Options

A. I , ii & iii
B. ii, iii & iv
C. I , ii & iv
D. all are correct

Explanation

To determine which of the given values about lung volumes are correct, we will analyze each value provided in the question.

### Step-by-Step Solution:

1. **Residual Volume (RV)**:
- The residual volume is the amount of air that remains in the lungs after a maximum forced expiration.
- The value given is 1200 ml.
- **Correctness**: This value is generally accepted as correct for an average adult.
- **Conclusion**: **Correct**.

2. **Vital Capacity (VC)**:
- Vital capacity is the maximum amount of air a person can expel from the lungs after maximum inhalation.
- It is calculated as the sum of the inspiratory reserve volume, tidal volume, and expiratory reserve volume.
- The value given is 5.5 to 6.5 liters.
- **Correctness**: The typical range for vital capacity is approximately 3 to 5 liters, making the provided range incorrect.
- **Conclusion**: **Incorrect**.

3. **Expiratory Reserve Volume (ERV)**:
- The expiratory reserve volume is the amount of extra air that can be forcibly exhaled after the expiration of a normal tidal volume.
- The value given is 1100 ml.
- **Correctness**: This value is consistent with standard physiological values for adults.
- **Conclusion**: **Correct**.

4. **Minute Respiratory Volume (MRV)**:
- Minute respiratory volume is the total amount of new air that is removed from the respiratory passages each minute, calculated as tidal volume multiplied by respiratory rate.
- The value given is 6000 to 8000 ml.
- **Correctness**: Given that the average tidal volume is about 500 ml and the respiratory rate is about 12 to 16 breaths per minute, the minute respiratory volume can indeed range between 6000 to 8000 ml.
- **Conclusion**: **Correct**.

### Summary of Correct Values:
- **Residual Volume**: Correct (1200 ml)
- **Vital Capacity**: Incorrect (5.5 to 6.5 liters)
- **Expiratory Reserve Volume**: Correct (1100 ml)
- **Minute Respiratory Volume**: Correct (6000 to 8000 ml)

### Final Answer:
The correct values are:
- Residual Volume: Correct
- Expiratory Reserve Volume: Correct
- Minute Respiratory Volume: Correct

Thus, the correct values are the first, third, and fourth.

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