But when it gets the cells and tissues of our body, it has no problem actually unloading and releasing that often to the cells of the tissues of our body. So we conclude that myoglobin does not bind oxygen cooperatively. And this basically makes it a great storing molecule. So it stores the oxygen in the muscle cells of our body because it only releases it when the concentration drops to very low value. On the other hand, because the hemoglobin consists of these four individual polypeptide chains, these polypeptide chains, the heme groups can interact with one another and they can basically induce the release or the binding of the oxygen. And so this means if it makes it a perfect molecule to act as a carrier of oxygen inside our blood system, so that's exactly why hemoglobin is used by our body to basically take that oxygen in the lungs and bring it to the tissues of our body.