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The heart pumps blood to the body through a complex network of arteries. With exception of the coronary arteries, which nourish the heart itself, most arteries transport oxygen-rich blood away from the heart.

Circulating in the blood are red blood cells, white blood cells, nutrients and other life-sustaining substances. Cholesterol and other fatty substances also circulate in the blood. Over time, these substances can be deposited in the artery walls, a condition called atherosclerosis. The deposited ... more