Physiology Respiratory System Pa 2 126ed480 Myoglobin dissociation curve is: A Almost linear B Parabola C Rectangular hyperbola D Sigmoid High-Yield Explanation Myoglobin dissociation curve is: Rectangular hyperbola. P50for myoglobin (PO2at which 50% of myoglobin is saturated)- 5 mmHg. Myoglobin has high affinity for O2.