The y-axis of the oxygen-haemoglobin dissociation curve represents

the partial pressure of oxygen

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the partial pressure of carbon dioxide

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the number of haemoglobin molecules available for oxygen transport

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the percentage of haemoglobin saturation

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Solution

The correct option is D the percentage of haemoglobin saturation
The oxygen-haemoglobin dissociation curve is an S-shaped curve, with the haemoglobin saturation percentage represented on the y-axis and the partial pressure of oxygen (in mmHg) on the x-axis.

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