This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 2, Subject name: Physiology
Myoglobin dissociation curve is: 
Select and explain. 
A. Almost linear, B. Parabola, C. Rectangular hyperbola, D. Sigmoid
C: Rectangular hyperbola
Answer: C: Rectangular hyperbola 
Explanation: Myoglobin dissociation curve is: Rectangular hyperbola. P50for myoglobin (PO2at which 50% of myoglobin is saturated)- 5 mmHg. Myoglobin has high affinity for O2.