SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Illustration of cholesterol building up in an artery. Some cholesterol (seen here as small yellow spheres) is needed for the body to function properly. However, an excess of cholesterol can cause atherosclerosis and be a factor in predisposing blood vessels to thrombosis (blood clots). Image 1 of 3.
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