The Plateau Portion of the O₂ -Hb Curve

Multiple Choice

The plateau portion of the O₂ -Hb curve

A) is in the blood-PO₂ range that exists at the pulmonary capillaries.
B) means that hemoglobin becomes almost nearly saturated in the lungs unless the pulmonary capillary PO₂ falls below 60 mm Hg.
C) is in the blood-PO₂ range that exists at the systemic capillaries.
D) both (a) and (b) above.
E) both (b) and (c) above.