The most characteristic feature of hemoglobin is:
Correct answer: C. Its ability to combine reversibly with oxygen
- A. Its red colour
- B. Presence of iron
- C. Its ability to combine reversibly with oxygen
- D. Presence of basic protein globin
Explanation
The correct answer is c) Its ability to combine reversibly with oxygen. This ability to transport oxygen and release it where needed is the fundamental function of hemoglobin in red blood cells.
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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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