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Author Question: Deciding whether a study will compare different groups of individuals or examine changes within the ... (Read 125 times) |
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The longest a person has survived after a heart transplant is 24 years.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The familiar sounds of your heart are made by the heart's valves as they open and close.