The main target in the prevention of lung cancer is eliminating the _.
Correct answer: A. Tobacco smoking
- A. Tobacco smoking
- B. Chemicals
- C. Pollutants
- D. Mutagens
Explanation
Tobacco cigarettes contain nicotine and tar which acts as a carcinogen. Carcinogens are cancer causing chemicals. The most common and wide spread cause for lung cancer is smoking. Smoking especially in young adults is the most potential threat of lung cancer. Chances of lung cancer are ten times more in a person who smokes or lives in smoky areas as compared to those who dont. It is now estimated that 90% lung cancer is caused by smoking.
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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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