Although much `CO_(2)` is carried in blood, bloods does not become acidic because
(a) It is absorbed by the leucocytes
(b) Blood buffers play an important role in `CO_(2)` transport.
(c) It combines with water to from carbonic acid which is neutralized by `NaCO_(3)`
(d) It is continuously diffused through tissues and is not allowed to accumulate

Options

A. It is absorbed by the leucocytes
B. Blood buffers play an important role in `CO_(2)` transport.
C. It combines with water to from carbonic acid which is neutralized by `NaCO_(3)`
D. It is continuously diffused through tissues and is not allowed to accumulate

Answer

To solve the question, we need to understand why blood does not become acidic despite carrying a significant amount of carbon dioxide (CO₂). Let's analyze the options step by step:

### Step 1: Understanding CO₂ Transport in Blood
- Carbon dioxide is transported in the blood in three forms: dissolved in plasma, as bicarbonate ions (HCO₃⁻), and bound to hemoglobin.
- When CO₂ enters the blood, it reacts with water to form carbonic acid (H₂CO₃), which can dissociate into bicarbonate ions and protons (H⁺).

### Step 2: Analyzing the Options
- **Option (a): It is absorbed by the leucocytes.**
- This is incorrect. Leucocytes (white blood cells) do not absorb CO₂ in a way that would prevent blood from becoming acidic.

- **Option (b): Blood buffers play an important role in CO₂ transport.**
- This is correct. Blood contains buffers, primarily bicarbonate (HCO₃⁻), which help maintain pH by neutralizing excess acids. The bicarbonate buffer system is crucial in regulating blood pH.

- **Option (c): It combines with water to form carbonic acid which is neutralized by NaCO₃.**
- This is incorrect. While CO₂ does combine with water to form carbonic acid, sodium carbonate (NaCO₃) is not a significant component in blood buffering. The primary buffer is bicarbonate.

- **Option (d): It is continuously diffused through tissues and is not allowed to accumulate.**
- This is partially true, but it does not fully explain why blood does not become acidic. While CO₂ does diffuse out of the blood into the lungs, the buffering action is the main reason for maintaining pH.

### Conclusion
The correct answer is **(b) Blood buffers play an important role in CO₂ transport.** The bicarbonate buffering system helps maintain the pH of blood, preventing it from becoming acidic despite the presence of CO₂.