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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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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Goblet cells that line the intestine Goblet cells that line the intestine
The elephant raises its trunk as a sign of warning or to smell enemies or friends The elephant raises its trunk as a sign of warning or to smell enemies or friends
Assessing for Apley's Grinding Sign Assessing for Apley's Grinding Sign
Johannes Gutenberg, Page from the Forty-Two-Line Bible, Mainz. Johannes Gutenberg, Page from the Forty-Two-Line Bible, Mainz.
OraQuick. A negative result would show a red line at the "C" mark, whereas a positive ... OraQuick. A negative result would show a red line at the "C" mark, whereas a positive ...
Marasmus The emaciated appearance of this child is a sign (and symptom) of marasmus Marasmus The emaciated appearance of this child is a sign (and symptom) of marasmus
Video: Primary Active Transport - electrochemical gradient and ion transport / water movement

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