GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Narrowed artery. Computer artwork of a section through an artery (horizontal, centre) affected by atherosclerosis, showing red blood cells (red) and fat deposits (cream). Atherosclerosis is narrowing of the arteries (stenosis) due to deposits (atheromas) on its inner walls. Atheromas are typically made of cholesterol, decaying cells, blood cells and fatty proteins. Narrowing such as this raises blood pressure, which puts strain on the heart. Atherosclerosis is the main cause of heart attacks.
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