Question

The oxygen dissociation curve is

• A. Parabola
• B. Slope
• C. Sigmoid
• D. Straight line

Answer 1

The correct option is C

Sigmoid

Explanation for correct option

(C) Sigmoid

Oxygen dissociation curve

• Oxygen dissociation curves tell about the relationship between as partial pressure and hemoglobin saturation.
• The oxygen dissociation curve for hemoglobin is sigmoidal (i.e. S-shaped) as shown below:-
• 
• Due to the cooperative binding of oxygen to hemoglobin, the binding of oxygen initially increases with an increase in partial pressure of oxygen.
• Haemoglobin's affinity for oxygen is raised by the binding of one oxygen molecule.
• When hemoglobin is fully saturated with oxygen, it achieves a maximum level.

Explanation for incorrect option

Since the oxygen dissociation curve is sigmoidal. So, options (A), (B), and (D) are incorrect.

Hence, option (C) is correct. The oxygen dissociation curve is sigmoidal.