Maximum capacity of hemoglobin to absorb oxygen is:
Correct answer: D. 20 ml/100 ml blood
- A. 19.6ml/100 ml blood
- B. 25 ml/100 ml blood
- C. 30 ml/100 ml blood
- D. 20 ml/100 ml blood
Explanation
In 100 ml of blood, there is about 15 g of Hb, so that 100 ml of blood has the capacity to bind 20.1 ml of oxygen. This quantity is called the oxygen-binding capacity of blood (CB).
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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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