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Which of these type of curve shows the oxygen binding capacity of hemoglobin?

Which of these type of curve shows the oxygen binding capacity of hemoglobin? Correct Answer Sigmoidal curve

A single molecule of hemoglobin binds up to four molecules of oxygen (Hb+4O2 = Hb(O2)4). The sigmoidal curve shows the cooperativity in binding of oxygen and hemoglobin. This curve is a plot between the fractional saturation of hemoglobin versus the partial pressure of oxygen.

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