On the Oxygen Dissociation Curve (ODC), the P-50 Refers to The

Multiple Choice

On the oxygen dissociation curve (ODC) , the P-50 refers to the:

A) partial pressure of oxygen when the hemoglobin is 50% saturated.
B) hemoglobin saturation when the fraction of inspired oxygen is 50%.
C) partial pressure of oxygen when the fraction of inspired oxygen is 50%.
D) hemoglobin saturation when the partial pressure of oxygen is 50 mm Hg.