Your arteries become damaged from things like high blood pressure or smoking. When arteries are damaged, cholesterol can build up on the artery walls. This is called atherosclerosis. When this buildup hardens, its called plaque. Plaque buildup narrows the areteries and restricts blood flow. If plaque cracks or ruptures, a blood clot can form and block blood flow to the heart. When an artery gets blocked by a clot, blood and oxygen can't get to all parts of your heart. This causes a Heart Attack.
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