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Cholesterol is a type of lipid--an essential element contained in all human cells. However, excess lipids and other fatty substances in the blood can cause hyperlipidemia and other lipid disorders. Hyperlipidemia is a significant risk factor for development of atherosclerosis and heart disease.

The cardiovascular system comprises the heart, blood vessels, and blood. Blood has many life-sustaining responsibilities, including transporting oxygen, carbon dioxide, nutrients, and hormones throughout the body. Blood contains red blood cells, white ... more