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Uploaded by moyassin2007 on Apr 4, 2008
A heart attack occurs when blood flow to a section of heart muscle becomes blocked. If the flow of blood isn't restored quickly, the section of heart muscle becomes damaged from lack of oxygen and begins to die.
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ok now im scared
TheBigFanOfTwilight 2 years ago
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ok now im scared
TheBigFanOfTwilight 2 years ago