And the myoglobin only begins to unload or release that oxygen when the partial pressure drops to a very low quantity, and it essentially unloads it altogether. All the myoglobin unloads the oxygen very quickly and together when we drop that partial pressure to a certain value. So myoglobin does not release oxygen until the partial pressure drops to a very low quantity. Now, what is the physiological meaning behind this? Well, what this means is our body can actually use the myoglobin for oxygen storage to basically store the oxygen until it really, really needs it, when the cells have a very low concentration of oxygen. And that's exactly why myoglobin is the protein that is used by the muscle cells of our body to basically store the oxygen until that moment when we have very little oxygen found inside our body, when the lungs can no longer deliver the oxygen to the tissue of our muscle effectively and efficiently.