How many compounds of tar of tobacco smoke are included in causing cancer?
Correct answer: D. More than 10
- A. 2
- B. 8
- C. 5
- D. More than 10
Explanation
Recent researches indicate that more than 10 compounds of tar of tobacco smoke are involv in causing cancer.
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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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