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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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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.
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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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There are 20 feet of blood vessels in each square inch of human skin.
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Medication errors are more common among seriously ill patients than with those with minor conditions.