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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

Early divisions in the animal phylogeny. Early divisions in the animal phylogeny.
Vesalius’s De Humani Corporis Fabrica was an important early work on the human species. Vesalius’s De Humani Corporis Fabrica was an important early work on the human species.
Base pairing between pre-mRNA, U1 snRNA, and U2 snRNA early in the splicing proc Base pairing between pre-mRNA, U1 snRNA, and U2 snRNA early in the splicing proc
A release form for medical records. A release form for medical records.
The cascade of events by which the stroke-induced release of glutamate kills neurons. The cascade of events by which the stroke-induced release of glutamate kills neurons.
Formation of the Early Earth Formation of the Early Earth
Video: Optic Nerve and Optic Disk Animation (Part 2 of 2)

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