So the red curve, which describes the PH of, let's say, 7.2, so slightly lower, is shifted to the right side with respect to our blue curve. And this is what we call the Bore Effect. So let's take a look at the following curve at the following diagram and describe exactly how our hemoglobin's ability to oxygen actually decreases. So, let's begin with number one. So recall that on average, the partial pressure of oxygen inside our tissues is around 40 mercury. So the Y axis is the percent saturation of hemoglobin.