Haemoglobin carries more oxygen than plasma by:
Correct answer: C. 70 times
- A. 50 times
- B. 20 times
- C. 70 times
- D. 100 times
Explanation
Hemoglobin significantly enhances the oxygen-carrying capacity of blood by approximately 70 times compared to plasma. Hemoglobin, found in red blood cells, binds and transports oxygen efficiently, with each gram carrying about 1.34 mL of oxygen. Given the typical hemoglobin concentration of 15 g/dL in blood, this results in roughly 20 mL of oxygen per 100 mL of blood, far surpassing the minimal oxygen dissolved in plasma.
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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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