Myocardial infarction is caused by _______________.

Hardening of arteries

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Lumpy thickness develop in the inner walls of arteries.

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Clot may occur in the lumen of coronary artery.

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Sudden interruption in blood flow towards a portion of heart.

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Solution

The correct option is C Clot may occur in the lumen of coronary artery.
A heart attack occurs when one of the heart's coronary arteries is blocked suddenly or has extremely slow blood flow. A heart attack also is called a myocardial infarction. The usual cause of sudden blockage in a coronary artery is the formation of a blood clot.
So, the correct answer is clot may occur in the lumen of coronary artery.

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