So once oxygen is delivered to our muscle tissue the tissue must be able to store that oxygen for later use. And the protein that is responsible for storing the oxygen in our muscle tissue is known as myoglobin where Mayo means muscle and Globin means a polypeptide subunit. Now, in fact, if we compare the structure of hemoglobin to myoglobin we'll see that myoglobin, unlike hemoglobin, actually consists of only a single polypeptide Subun. And that single polypeptide subunit contains one heme group. And that means that myoglobin can only bind a single diatomic oxygen molecule. On top of that, because we don't have more than two polypeptide subunits within myoglobin to actually interact with one another and create Cooperativity, that implies that myoglobin will not display Cooperativity and so it will not create a sigmoidal curve.