$O_{2}$ dissociation curve is

Sigmoid

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Slope

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Straight line

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Parabola

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Solution

The correct option is A Sigmoid
Oxygen-haemoglobin dissociation curve explains the relation between the percentage saturation of haemoglobin and partial pressure of oxygen.
A sigmoid curve is obtained when the percentage saturation of haemoglobin with oxygen is plotted against pO2. Hence, the O2 dissociation curve is sigmoid.
So, the correct answer is 'sigmoid'.

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