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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).