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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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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