DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Narrowed coronary artery. Artwork of a coronary artery that has been partially blocked by atherosclerosis, the build-up of fatty plaques of atheroma (pale pink) on its inner wall. The heart is seen in the background. One of the main components of atheroma is the lipid cholesterol (yellow balls). Blockage of a coronary artery, one of the arteries that supply oxygen to the heart muscle, can cause chest pain (angina pectoris) or a heart attack (myocardial infarction).
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