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BHUBHU 2012Body Fluids and Circulation
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Heart attack, also called myocardial infarction (MI), refers to a sudden event in which, a portion of the heart muscle stops working because it no longer receives blood, usually due to a blockage in the coronary artery. Generally, a heart attack occurs when plaque (fat, cholesterol, and calcium) builds up and then ruptures in the coronary artery, creating a place where a blood clot can form (thrombus).