The dissociation curve is associated with

Options

A. Carbonic of erythrocytes
B. Carbon dioxide
C. Oxygen
D. Oxyhaemoglobin

Answer

**Step-by-Step Solution:**

1. **Understanding the Dissociation Curve**: The dissociation curve is a graphical representation that shows the relationship between the partial pressure of oxygen (pO2) and the saturation of hemoglobin with oxygen (often expressed as a percentage).

2. **Axes of the Curve**: In the dissociation curve, the horizontal axis represents the partial pressure of oxygen (pO2), while the vertical axis represents the percentage of hemoglobin saturation with oxygen.

3. **Identifying the Components**: The curve illustrates how hemoglobin binds to oxygen at different pressures. As the pO2 increases, hemoglobin becomes more saturated with oxygen.

4. **Recognizing the Key Term**: The term "dissociation" refers to the release of oxygen from hemoglobin, which is critical for understanding how oxygen is delivered to tissues in the body.

5. **Choosing the Correct Option**: Among the given options (carbonic, erythrocytes, carbon dioxide, oxygen, oxyhemoglobin), the term that directly relates to the dissociation curve is "oxyhemoglobin." This is because the curve specifically describes the behavior of hemoglobin when it is bound to oxygen.

6. **Final Answer**: Therefore, the dissociation curve is associated with **oxyhemoglobin** (Option D).

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