When parital pressure of `CO_(2)(p CO_(2))` rises the oxygen dissociation curve of haemoglobin will

Options

A. shift towards left
B. become irregualr
C. remain unchanged
D. shift towards right

Answer

### Step-by-Step Solution

1. **Understanding the Oxygen Dissociation Curve**:
The oxygen dissociation curve represents the relationship between the partial pressure of oxygen (pO2) and the percentage saturation of hemoglobin with oxygen. This curve is typically sigmoid in shape.

2. **Identifying Factors Affecting the Curve**:
Several factors can influence the position of the oxygen dissociation curve, including:
- Partial pressure of carbon dioxide (pCO2)
- Temperature
- pH (H+ ion concentration)

3. **Effect of Increased pCO2**:
When the partial pressure of carbon dioxide (pCO2) rises, it leads to a decrease in pH (more acidic environment). This phenomenon is known as the Bohr effect, where increased pCO2 enhances the release of oxygen from hemoglobin.

4. **Direction of the Shift**:
An increase in pCO2 causes the oxygen dissociation curve to shift to the right. This indicates that at a given pO2, hemoglobin will have a lower saturation with oxygen, meaning it releases oxygen more readily.

5. **Conclusion**:
Therefore, when the partial pressure of CO2 rises, the oxygen dissociation curve of hemoglobin will shift towards the right.

### Final Answer
The correct answer is: **Shift towards right**.

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