EVAN OTO / SCIENCE PHOTO LIBRARY EVAN OTO / SCIENCE PHOTO LIBRARY
An illustration of a man suffering from a heart attack, as well as a heart with a blockage in a branch of the left coronary artery. The narrowing of the coronary artery from conditions such as atherosclerosis, reduces blood flow to myocardial tissue and can cause damage or death to heart muscle cells when completely restricted, leading to a myocardial infarction.
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