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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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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.