1. The brain is the body's most complex organ.
    1. There are around 86 billion neurons in the human brain, all of which are in use.
    2. Each neuron communicates with many other neurons to form circuits and share information.
    3. Proper nervous system function involves coordinated action of neurons in many brain regions.
    4. The nervous system influences and is influenced by all other body systems (e.g., cardiovascular, endocrine, gastrointestinal and immune systems).
    5. Humans have a complex nervous system that evolved from a simpler one.
    6. This complex organ can malfunction in many ways, leading to disorders that have an enormous social and economic impact.

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