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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 training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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Blood is approximately twice as thick as water because of the cells and other components found in it.

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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Survivorship curve for the North American beaver. Survivorship curve for the North American beaver.
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Video: Pressure Flow Model Animation

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