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Author Question: The respiratory and digestive systems in the embryo develop from the A) ectoderm of the embryonic ... (Read 32 times) |
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If you could remove all of your skin, it would weigh up to 5 pounds.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.