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(A) The $O_2$ dissociation curve,also known as the oxygen-hemoglobin dissociation curve,plots the proportion of hemoglobin in its saturated form on th

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Sigmoid curve

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(A) The $O_2$ dissociation curve,also known as the oxygen-hemoglobin dissociation curve,plots the proportion of hemoglobin in its saturated form on the vertical axis against the prevailing oxygen tension on the horizontal axis.This curve is $S$-shaped,which is technically referred to as a sigmoid curve.This shape reflects the cooperative binding of oxygen to hemoglobin,where the binding of one $O_2$ molecule increases the affinity of the remaining heme groups for oxygen.

The $O_2$ dissociation curve is a....

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