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Author Question: As Joe prepares to spar with a Taekwondo opponent, his heart rate and respiration rate increase. ... (Read 63 times) |
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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People about to have surgery must tell their health care providers about all supplements they take.