And this is important because we want to ensure that the cells in our body that have a higher rate of metabolism receive that oxygen that is needed to produce ATP for the cell to actually function correctly and efficiently. Now, from this graph, we also see another important point. Notice that at a partial pressure of about 100 mercury, which is the partial pressure inside the alveoli of our lungs, our percent saturation of hemoglobin for both curves at both PH values is approximately the same. And this is important point because even if our cells of the body are exercising, we don't want that to actually affect hemoglobin's affinity for oxygen inside our lungs because we want to basically make sure that the hemoglobin inside the lungs continually accept those oxygen molecules and brings those oxygen molecules to the exercising tissue. So notice that a change in PH does not really affect the affinity of hemoglobin at high partial pressure value. So physiologically, this is beneficial because we do not want hemoglobin to bind less oxygen in our lungs.