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 explanation 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 process occurs primarily in the tissues where CO2 concentration is high.

2. **Transport of CO2**:
- Once formed, carbamino hemoglobin transports CO2 from the tissues to the lungs. In the lungs, the environment changes significantly.

3. **Alveolar Environment**:
- In the alveoli, the concentration of CO2 is lower than in the blood. This concentration gradient plays a crucial role in the dissociation process.

4. **Dissociation Mechanism**:
- The dissociation of CO2 from carbamino hemoglobin occurs due to the decrease in CO2 concentration in the alveoli. As CO2 diffuses from the blood into the alveoli, the binding of CO2 to hemoglobin is reduced, leading to the release of CO2.

5. **Role of Partial Pressure**:
- The partial pressure of gases is a key factor in this process. In the alveoli, the partial pressure of oxygen (O2) is higher, which promotes the release of CO2 from hemoglobin (a phenomenon known as the Haldane effect).

6. **Conclusion**:
- Therefore, the dissociation of CO2 from carbamino hemoglobin in the alveoli occurs primarily due to the lower concentration of CO2 in the alveoli compared to the blood, along with the influence of the partial pressures of O2 and CO2.

### Final Answer:
In the alveoli, dissociation of CO2 from carbamino hemoglobin occurs due to the lower concentration of CO2 in the alveoli compared to the blood, influenced by the partial pressure of gases.