How many compounds of tar in tobacco smoke are included in causing cancer?
Correct answer: D. More than 10
- A. 2
- B. 5
- C. 8
- D. More than 10
Explanation
The correct answer is "D". Tobacco smoke is made up of thousands of chemicals, including at least 70 known to cause cancer. This option suggests that more than ten compounds of tar in tobacco smoke are included in causing cancer. This option is the closest to the truth. The exact number of carcinogenic compounds in tobacco smoke is complex and can vary depending on the type of tobacco and smoking conditions. However, it is well-established that tobacco smoke contains numerous carcinogens, and the actual number is indeed more than ten.
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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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