Transcription: A heart attack or myocardial infarction occurs when blood is prevented from reaching a portion of heart muscle, causing damage to the heart. A heart attack may be caused when blood vessels become blocked by an embolus, or circulating blood clot, which then functions as a plug, sealing off a specific area of the heart from essential blood supply and causing death of heart cells due to lack of oxygen. Heart attacks are also caused by atherosclerosis, a condition in which accumulating fatty deposits in the walls of an artery reduce the diameter of the vessel. Extreme fatty buildup may completely ...
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