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.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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