Binding of oxygen to myoglobin:
Is characterized by the sigmoidal saturation curve
Occurs at multiple sites
Is characterized by the sigmoid and multiple hyperbolic saturation curve
Is characterized by the hyperbolic saturation curve
Myoglobin molecule contains a single O2 binding site and thus the saturation process is characterized by a simple hyperbolic curve, in contrast to hemoglobin, sigmoid saturation curve of which shows positive cooperativity of multiple oxygen binding sites. Ref: Lippincott's Biochemistry, 5th Ed page 26