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The familiar sounds of your heart are made by the heart's valves as they open and close.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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For high blood pressure (hypertension), a new class of drug, called a vasopeptidase blocker (inhibitor), has been developed. It decreases blood pressure by simultaneously dilating the peripheral arteries and increasing the body's loss of salt.

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