Which of the following represents a correct statement about data presented in the graph? view available hint(s) focus your attention on the graph shown, from the left side of the focus figure. the percent of saturation of hemoglobin is plotted (on the y-axis) against (mm hg) (on the x-axis). use this graph to complete parts a–c below. on this graph, the y-axis (the vertical edge) tells you how much is bound to hemoglobin (hb). at 100%, each hb molecule has four bound oxygen molecules. the x-axis (the horizontal edge) tells you the relative amount (partial pressure) of dissolved in the fluid surrounding the hb. if more is present, more is bound. however, because of hb's properties ( binding strength changes with saturation), this is an s-shaped curve, not a straight line. which of the following represents a correct statement about data presented in the graph?
a. in blood with 30% oxygen saturation of hemoglobin, there is a po2 of ~60 mm hg in surrounding fluid.
b. in blood with 60% oxygen saturation of hemoglobin, each individual hemoglobin binds ~2.5 oxygens.
c. blood with three oxygens per hemoglobin represents a saturation of po2 at ~30 mm hg.
d. in blood with a po2 of 30 mm hg, the average saturation of all hemoglobin proteins is 60%.