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Heart Attack / Myocardial Infarction
The heart is a mechanical, contractile pump responsible for maintaining blood circulation. It is made of specialized muscle called myocardium and weighs about 10 ounces in the average adult, although many factors affect its ultimate size. This muscle is activated by timed electrical impulses from a part of the heart called the sinoatrial node, the natural pacemaker of the heart. Since the heart is constantly active, it requires an uninterrupted ...
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