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a heart attack (myocardial infarction) is permanent damage to your heart muscle. it happens when a blocked artery leads to a lack of blood supply.
As a large, muscular pump, the heart relies on a constant supply of oxygen-rich blood to function. Without a blood supply, heart muscle begins to die. This is exactly what happens during a heart attack. Myocardial infarction, the medical term for heart attack, literally means heart tissue damage or death.. Heart attacks most commonly occur when one or more of the coronary arteries â a network of blood vessels that supply blood to the heart â become blocked. Heart muscle becomes starved for oxygen and nutrients.