What happens to the hemoglobin saturation of the red blood cells as the cells move to tissues that have lower oxygen concentrations? Red Blood cells are able to transport oxygen throught out the body because oxygen binds to hemoglobin molecules within the blood cells. To learn how the concentration of oxygen in tissues affects the binding of oxygen to the hemoglobin molecule, researchers devised the following study. Samples of human blood were taken from various tissues. In each sample, the researchers measured the amount of dissolved oxygen in the tissue and isolated the hemoglobin. The amount of isolated hemoglobin was measured and then separated to determine how much of the hemoglobin had all of its binding sites filled with oxygen. The amount of saturate hemoglobin was compared with the total amount of hemoglobin to yield the percentage of hemoglobin saturation. Some results of the study are shown in the graph (attached). Use the graph to answer the questions that follow. (SEE ATTACHED, just the graph) a. If the concentration of oxygen in a sample of body tissues is 4%, what is the hemoglobin saturation of the red blood cells in the sample? b. What happens to the hemoglobin saturation of the red blood cells as the cells move to tissues that have lower oxygen concentrations? c. What must happen to the oxygen bound to the hemoglobin as the red blood cells move to tissues with lower concentrations? d. Consider the answer to Question d. What part does this play in your survival?