Passage VII
The amount of O2 present in blood and tissues can be measured, in mm Hg, as the partial pressure of O2 (
). The percent saturation of Hb is the percent of hemoglobin in the blood that is bound with O2. Figure 1 shows the relationship between percent saturation of Hb and , at normal body conditions.
Figure 2 shows the relationship between percent saturation of Hb and , at different pHs. The pH of blood is affected by the partial pressure of CO2 ().
Figure 3 shows the relationship between percent saturation of Hb and , at different blood temperatures.
36. According to Figure 1, the greatest change in the percent saturation of Hb occurs within which of the following partial pressure ranges?
Your Answer is
Correct Answer is G
Explanation
Looking at figure 1, the change in percent saturation is the largest, indicating that the slope of the line segment is the largest. The abscissa corresponding to the part with the largest slope should be 20-30