Which one of the following is the correct statement for respiration in humans ?

Options

A. Neural signals form peneumotoxic centre in poins region of brain can increase
B. worker in grinding and stone breaking industries may suffer from lung fibrosis
C. about 90% of carbon dioxide `(CO_(2))` is carried by haemoglobin as carbamino haemoglobin
D. cigarette smoking may lead to inflammation of bronchi

Explanation

To solve the question "Which one of the following is the correct statement for respiration in humans?", we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Analyze the First Option**:
- The first option states that "neural signals from the pneumotoxic center in the pons region of the brain can increase respiration."
- The pneumotoxic center in the pons actually functions to regulate the rhythm of breathing by inhibiting inspiration. Therefore, it does not increase respiration but rather reduces the duration of inspiration, which can lead to an increased respiratory rate.
- **Conclusion**: This statement is incorrect.

2. **Analyze the Second Option**:
- The second option claims that "workers in the grinding and stone breaking industry may suffer from lung fibrosis."
- In industries involving grinding and stone breaking, workers are often exposed to high levels of dust. Prolonged exposure to this dust can lead to lung damage and the proliferation of fibrous tissue, resulting in lung fibrosis.
- **Conclusion**: This statement is correct.

3. **Analyze the Third Option**:
- The third option states that "about 90% of carbon dioxide is carried by hemoglobin as carbamino hemoglobin."
- In reality, only about 20-25% of carbon dioxide is transported by hemoglobin in the form of carbamino hemoglobin. The majority of carbon dioxide is transported in the form of bicarbonate ions (HCO3-) in the plasma.
- **Conclusion**: This statement is incorrect.

4. **Final Conclusion**:
- After analyzing all options, the correct statement regarding respiration in humans is the second option: "workers in the grinding and stone breaking industry may suffer from lung fibrosis."

### Final Answer:
The correct statement for respiration in humans is: **B) Workers in the grinding and stone breaking industry may suffer from lung fibrosis.**