This file about animation of heart vessel blockage, Heart disease is a result of plaque buildup in your coronary arteries, a condition called atherosclerosis, that leads to blockages. The arteries, which start out smooth and elastic, become narrow and rigid, restricting blood flow to the heart. The heart becomes starved of oxygen and the vital nutrients it needs to pump properly.
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This file is about How Prions Arise. There is evidence that the infectious agent associated with certain brain diseases such as Creutzfeldt-Jakob disease in humans and mad cow disease in animals may be caused by protein