The oxygen dissociation curve of haemoglobin | vedclass

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(A) The oxygen dissociation curve of haemoglobin is a sigmoid ($S$-shaped) curve. This curve is obtained when the percentage saturation of haemoglobin

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Sigmoid

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(A) The oxygen dissociation curve of haemoglobin is a sigmoid ($S$-shaped) curve. This curve is obtained when the percentage saturation of haemoglobin with $O_2$ is plotted against the partial pressure of oxygen $(pO_2)$. The sigmoid shape is due to the cooperative binding of oxygen to the four haem groups of the haemoglobin molecule,where the binding of the first oxygen molecule increases the affinity of the remaining haem groups for subsequent oxygen molecules.

The oxygen dissociation curve of haemoglobin is:

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