If you could remove all of your skin, it would weigh up to 5 pounds.
Did you know?
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Three Chamber Heart -- Circulatory System
lymphatic system
The Nervous System
The digestive system.
Most Americans obtain their drinking water from a community water system