Myoglobin only releases that oxygen to the muscle cells when the concentration drops to a very small value. And when it drops below a certain value, ultimately, all these myoglobin molecules in a cell will release that oxygen together. And that's exactly what the sharp increase or decrease in that blue curve actually means. Now let's move on to hemoglobin. Notice, unlike hemoglobin, unlike my globin, the curve for hemoglobin is not as sharp. In fact, we have this s shape curve, and this s shape is known as the sigmoidal shape curve.