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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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All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.
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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 over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.