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Carbon monoxide from tobacco smoke harms the body mainly because it:
ABinds haemoglobin and lowers its oxygen-carrying capacity
BInflames the alveoli and causes emphysema directly
CIs carcinogenic and triggers lung cancer
DIncreases gastric secretion causing ulcers
Answer & Solution
Correct answer: A. Binds haemoglobin and lowers its oxygen-carrying capacity
1. The text lists separate harmful effects of tobacco smoke components.
2. Carbon monoxide binds to the haemoglobin of red blood cells, reducing oxygen-carrying capacity and causing tissue hypoxia.
3. Emphysema, lung cancer and ulcers are attributed to alveolar inflammation, benzopyrene, and gastric secretion respectively, so B, C and D mismatch the cause.
4. Hence the answer is A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Health and Diseases", p.311_
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