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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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The human body produces and destroys 15 million blood cells every second.