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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Examples of sensory receptors in the skin of mammals. Examples of sensory receptors in the skin of mammals.
All computer systems perform four basic functions: input, processing, storage, and output. All computer systems perform four basic functions: input, processing, storage, and output.
Cranial nerves and their target regions. (Sensory nerves are shown in blue; motor nerves, in red.) Cranial nerves and their target regions. (Sensory nerves are shown in blue; motor nerves, in red.)
Neurons Neurons
Examples of Sensory Receptors Examples of Sensory Receptors
Neurons in the outer layers of the brain Neurons in the outer layers of the brain
Video: Wound Repair Animation

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