In the alveoli, dissociation of `CO_(2)` from carbamino haemoglobin occur, due to

Options

A. `P_(CO_(2))` is high and `P_(O_(2))` P is low
B. `P_(CO_(2))` is low and `P_(O_(2))` is high
C. `P_(CO_(2))` and `P_(O_(2))` are high
D. `P_(CO_(2))` and `P_(O_(2))` are low

Answer

To answer the question regarding the dissociation of CO₂ from carbamino hemoglobin in the alveoli, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Hemoglobin's Role**:
- Hemoglobin is a protein in red blood cells that binds to both oxygen (O₂) and carbon dioxide (CO₂). When it binds to CO₂, it forms a compound known as carbamino hemoglobin.

2. **Conditions in the Alveoli**:
- In the alveoli of the lungs, the concentration of gases varies. The partial pressure of oxygen (pO₂) is high because oxygen from the air enters the alveoli.
- Conversely, the partial pressure of carbon dioxide (pCO₂) is low in the alveoli compared to the pO₂.

3. **Gas Exchange Mechanism**:
- The binding and release of gases by hemoglobin depend on their partial pressures. Hemoglobin will release CO₂ when the pCO₂ is low and will bind to O₂ when the pO₂ is high.
- In the alveoli, the high pO₂ promotes the binding of oxygen to hemoglobin, while the low pCO₂ facilitates the release of CO₂ from carbamino hemoglobin.

4. **Conclusion**:
- Therefore, the dissociation of CO₂ from carbamino hemoglobin occurs due to the low partial pressure of carbon dioxide and the high partial pressure of oxygen in the alveoli.

### Final Answer:
The dissociation of CO₂ from carbamino hemoglobin occurs due to the **low partial pressure of carbon dioxide and high partial pressure of oxygen** in the alveoli.

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