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Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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Video: Cardiac Cycle (Part 3 of 4)

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