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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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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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.