Below is a fractional saturation curve for O₂ binding to adult hemoglobin. Assume that curve Y represents a system at pH 7.4 and with a normal physiological level of 2,3-BPG. Curve X represents a system that A) is at pH 7.4 with a higher than normal physiological level of 2,3-BPG. B) has a higher pH with a normal physiological level of 2,3-BPG. C) has a lower pH with a normal physiological level of 2,3-BPG. D) is at pH 7.4 with a normal physiological level of 2,3-BPG but with an increased level of CO₂.

Question

Quizplus · Accepted Answer

Curve X has a lower oxygen affinity compared to curve Y since it reaches 50% saturation at a higher partial pressure of oxygen. This suggests that curve X represents a system with a higher pH, as higher pH tends to decrease hemoglobin's oxygen binding affinity. None of the other options would result in a lower oxygen affinity compared to curve Y.

Below Is a Fractional Saturation Curve for O2 Binding to Adult

Below Is a Fractional Saturation Curve for O₂ Binding to Adult