Select the correct statement.

Easy

A

Binding of oxygen with haemoglobin is primarily related to the partial pressure of CO₂.
B

The amount of O₂ that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of CO₂.
C

About 70 per cent of O₂ is transported by RBCs in the blood and the remaining 30 per cent of O₂ is carried in a dissolved state through the plasma.
D

A sigmoid curve is obtained when the percentage saturation of haemoglobin with O₂ is plotted against the pO₂.

Solution

Oxygen-haemoglobin dissociation curve is sigmoidal in shape because hemoglobin has an increasing affinity for O₂ as the number of bound O₂ molecules goes up (positive cooperativity). No more binding is possible after four oxygen molecules bind. Binding of oxygen with haemoglobin is primarily related to the partial pressure of O₂. Binding of oxygen with haemoglobin is primarily related to the partial pressure of O₂. The amount of CO₂that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O₂. About 97 per cent of O₂ is transported by RBCs in the blood and the remaining 3 per cent is carried in a dissolved state through the plasma.

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