Haemoglobin can be almost completely oxygenated by an oxygen pressure of __________ of mercury.
Correct answer: D. 100 mm
- A. 10 mm
- B. 60 mm
- C. 10 cm
- D. 100 mm
Explanation
At an oxygen partial pressure of about 100 mm Hg, haemoglobin is almost completely saturated because the oxygen-haemoglobin dissociation curve is near its plateau. Students may choose 60 mm Hg because it is a substantial oxygen pressure, but saturation is not yet nearly maximal at that value.
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