The oxygen carrying capacity of haemoglobin in humans when the blood is 100% oxygenated is:
Correct answer: C. 20 ml
- A. 19.4 ml
- B. 19.6 ml
- C. 20 ml
- D. 21 ml
Explanation
In 100 ml of blood, there is about 15 g of hemoglobin, which can bind approximately 20.1 ml of oxygen. This value is considered the oxygen binding capacity of blood (Cb). The correct answer is 20 ml because it reflects the typical carrying capacity when hemoglobin is fully saturated with oxygen. Options 19.4 ml and 19.6 ml are slightly lower than the actual capacity, while 21 ml exceeds the normal capacity for hemoglobin in fully oxygenated blood.
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