`CO_(2)` dissocated from carbamino haemoglobin when

Options

A. `pCO_(2)` is high and `pO_(2)` Is low
B. `pO_(2)` is high and `pCO_(2)` IS low
C. `pCO_(2)" and "pO_(2)` are equal
D. None of the above

Explanation

To answer the question of when CO₂ dissociates from carbamino hemoglobin, we can break down the process into several steps:

### Step-by-Step Solution:

1. **Understanding Carbamino Hemoglobin**:
- Carbamino hemoglobin is formed when carbon dioxide (CO₂) binds to hemoglobin in red blood cells. This typically occurs in tissues where CO₂ concentration is high.

2. **Conditions for Dissociation**:
- The dissociation of CO₂ from carbamino hemoglobin is influenced by the partial pressures of oxygen (pO₂) and carbon dioxide (pCO₂) in the surrounding environment.

3. **Role of Partial Pressures**:
- In the lungs, the partial pressure of oxygen is high due to the fresh air being inhaled, while the partial pressure of carbon dioxide is low because CO₂ is being expelled from the bloodstream into the alveoli.

4. **Gas Exchange in the Lungs**:
- When blood reaches the lungs, the high pO₂ promotes the release of CO₂ from carbamino hemoglobin. This is because gases move from areas of higher partial pressure to areas of lower partial pressure.

5. **Conclusion**:
- Therefore, CO₂ dissociates from carbamino hemoglobin when the partial pressure of oxygen (pO₂) is high and the partial pressure of carbon dioxide (pCO₂) is low, which occurs in the alveoli of the lungs.

### Final Answer:
CO₂ dissociates from carbamino hemoglobin when the partial pressure of oxygen (pO₂) is high and the partial pressure of carbon dioxide (pCO₂) is low.