Based on the Plot of Oxygen Saturation Versus Partial Pressure

question 1

Multiple Choice

Based on the plot of oxygen saturation versus partial pressure of oxygen, which of the following statements is true?

• A)at oxygen pressure >100 mm Hg, hemoglobin dissociates into individual subunits so that it is able to bind oxygen similar to myoglobin
• B)at typical resting capillary oxygen pressure of ~30 mm Hg, hemoglobin has only 1 of its 4 oxygen binding sites filled while myoglobin is nearly saturated with oxygen
• C)under periods of extreme muscle exertion, capillary oxygen pressure can drop to 10 mm Hg, allowing release of ~90% of oxygen carried by hemoglobin
• D)the structure of hemoglobin allows for complete release of oxygen in capillary beds at all times
• E)none of the above

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