The maximum capacity of haemoglobin to absorb oxygen is:
Correct answer: B. 20 ml/100 ml blood
- A. 19.6ml/100 ml blood
- B. 20 ml/100 ml blood
- C. 25 ml/100 ml blood
- D. 30 ml/100 ml blood
Explanation
The maximum amount of oxygen which normal human blood absorbs and carries at sea-level is about 20ml/100 ml of blood. This is the maximum capacity of haemoglobin for oxygen when it is fully oxygenated.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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