BO VEISLAND, MI&I / SCIENCE PHOTO LIBRARY BO VEISLAND, MI&I / SCIENCE PHOTO LIBRARY
Atheroma. Cutaway illustration of the inside of a human artery showing fatty plaques of atheroma. The artery has three distinct layers. The tunica adventitia (outer layer) is fibroelastic and the tunica media (middle layer) is muscular. The inner layer, the tunica intima, is composed of a layer of endothelial cells (large, orange) supported by connective tissue. Atheroma (green and yellow, centre right) is a mixture of low- density lipoproteins, decaying muscle cells, fibrous tissue, blood platelets and cholesterol. It has narrowed the artery and caused thinning and damage to the endothelial layer (atherosclerosis). M175/200).
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