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Did you know?
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.
Did you know?
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Did you know?
Approximately 25% of all reported medication errors result from some kind of name confusion.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.