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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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The human body produces and destroys 15 million blood cells every second.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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Video: Muscle Twitch and Muscle Tension - Motor unit size and force

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