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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%