Final answer:
The oxygen-binding curve for Hb, or hemoglobin, is plotted as a function of the partial pressure of oxygen in the blood versus the relative Hb-oxygen saturation.
Step-by-step explanation:
The oxygen-binding curve for Hb, or hemoglobin, can be plotted as a function of the partial pressure of oxygen in the blood (x-axis) versus the relative Hb-oxygen saturation (y-axis). This resulting graph, also known as the oxygen dissociation curve, is sigmoidal or S-shaped. As the partial pressure of oxygen increases, the hemoglobin becomes increasingly saturated with oxygen. It is important to note that the curve can shift to the left or right depending on environmental conditions.