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. We see that both curves, the blue curve and the red curve, show that at a partial pressure of 100 mercury, the percent of hemoglobin that is fully saturated with oxygen is about 98%. So even though the PH decreases when our cells are exercising and producing more carbon dioxide, our hemoglobin binds the same exact percentage of oxygen inside our lungs. But once the hemoglobin actually brings that oxygen into the exercising tissue, this is where we see the bore effect really take its place.