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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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The FDA recognizes 118 routes of administration.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.