Because there is a higher concentration of oxygen, a higher partial pressure of oxygen in the capillaries, hemoglobin will dissociate oxygen and it will move the oxygen into the tissues of our body. And if we plot the percent of hemoglobin saturated with oxygen versus the partial pressure of oxygen, we get the oxygen hemoglobin dissociation curve, which is shown by the following blue curve. Now, notice the blue curve has an S shape. This is known as a Sigmoidal shape. And the reason it is a Sigmoidal shape is because of this positive cooperative behavior of hemoglobin. And we'll see why that's the case in just a moment.