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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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There are 20 feet of blood vessels in each square inch of human skin.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.