It contains the following curve. Now, the next question is what exactly is the physiological significance of these two curves? And how do these curves actually correspond to the function of these two different proteins? So let's begin inside our lungs. So inside our lungs, we have a partial pressure of oxygen that is equal to about 100 mercury. So if we take a look at the following curve and we plot a vertical line going up from the 100 points, and then we check the corresponding Y value for both of these curves, we see that according to these curves, both myoglobin and hemoglobin are about 98% saturated with oxygen when inside our lungs.