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Coronary heart disease, the most common cardiovascular disease, is mainly caused by:
ADeposition of cholesterol in the blood vessels
BInfection of the heart by Streptococci bacteria
CInflammation of the pericardium membrane
DWeakening of the heart valves over time
Answer & Solution
Correct answer: A. Deposition of cholesterol in the blood vessels
1. Coronary heart disease (CHD) is the commonest form of cardiovascular disease.
2. It is caused by cholesterol deposition forming plaque, which narrows arteries (atherosclerosis) and reduces blood supply to the heart muscle.
3. Bacterial infection, pericardial inflammation and valve weakening are not the stated cause, so B, C and D are traps.
4. Hence the answer is A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Health and Diseases", p.315_
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