With decrease in temperature, oxyhaemoglobin curve will become

Options

A. straight
B. more steep
C. parabola n
D. none of these

Answer

To answer the question about how the oxyhemoglobin curve changes with a decrease in temperature, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Oxyhemoglobin Curve**:
- The oxyhemoglobin dissociation curve is typically an S-shaped (sigmoid) curve that represents the relationship between the partial pressure of oxygen (pO2) and the percentage saturation of hemoglobin with oxygen.

2. **Factors Affecting the Curve**:
- The position of the oxyhemoglobin curve can shift due to several factors, including temperature, pH, and the concentration of 2,3-bisphosphoglycerate (DPG).
- A rightward shift indicates a decrease in hemoglobin's affinity for oxygen, meaning that hemoglobin releases oxygen more readily.
- A leftward shift indicates an increase in hemoglobin's affinity for oxygen, meaning that hemoglobin holds onto oxygen more tightly.

3. **Effect of Temperature on the Curve**:
- When the temperature decreases, the affinity of hemoglobin for oxygen increases. This means that hemoglobin will hold onto oxygen more tightly, which causes the curve to shift to the left.
- As a result of this leftward shift, the curve becomes steeper, indicating that at lower partial pressures of oxygen, hemoglobin will be more saturated with oxygen compared to higher temperatures.

4. **Conclusion**:
- Therefore, with a decrease in temperature, the oxyhemoglobin curve will become steeper and shift to the left.

### Final Answer:
The oxyhemoglobin curve will become steeper with a decrease in temperature.

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