Although much `CO_(2)` is carried in blood, yet blood does not become acidic, because

Options

A. a) `CO_(2)` is absorbed by the leucocytes
B. b) Oxygen combines with haemoglobin to form oxyhaemoglobin
C. c) `CO_(2)` transport and blood buffers play an important role in it
D. d) it is continously diffused through the tissues and is not allowes to accumulate.

Explanation

### Step-by-Step Solution:

1. **Understanding the Role of CO₂ in Blood**:
- Carbon dioxide (CO₂) is a byproduct of cellular respiration and is transported in the blood. A significant amount of CO₂ is carried in the form of bicarbonate ions (HCO₃⁻).

2. **Buffering Action of Blood**:
- Blood has a buffering system that helps maintain a stable pH. The primary buffer in blood is bicarbonate (HCO₃⁻), which prevents the blood from becoming too acidic even when CO₂ levels are high.

3. **Equilibrium with Carbonic Acid**:
- Bicarbonate ions exist in equilibrium with carbonic acid (H₂CO₃). The reaction can be represented as:
\[ CO₂ + H₂O \leftrightarrow H₂CO₃ \leftrightarrow HCO₃⁻ + H⁺ \]
- This equilibrium allows the blood to manage excess H⁺ ions, which would otherwise lower the pH and make the blood acidic.

4. **Conversion of Carbonic Acid**:
- Carbonic acid can dissociate into carbon dioxide and water, which further helps in regulating the levels of CO₂ and maintaining pH balance:
\[ H₂CO₃ \leftrightarrow CO₂ + H₂O \]

5. **Conclusion**:
- The presence of bicarbonate ions and their ability to buffer changes in pH is why blood does not become acidic despite carrying a significant amount of CO₂. Therefore, the correct answer to the question is that carbon dioxide transport and blood buffers play an important role in maintaining blood pH.