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.

Question

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The plateau portion of the O2-Hb curve corresponds to the blood-PO2 range in the pulmonary capillaries, where hemoglobin becomes nearly saturated unless the PO2 falls below 60 mm Hg.

The Plateau Portion of the O2 -Hb Curve

The Plateau Portion of the O₂ -Hb Curve