What does my brain do, besides think?

The brain is the command center of the body; it controls and processes everything people do—eating, talking, walking, thinking, remembering, and sleeping. The brain, being the most complicated organ in the human body, informs us what's happening on outside the bodies (for example, whether we're chilly or hot, or if the person approaching us is a friend or a stranger) as well as what's going on within our bodies (whether people have an infection or a broken bone, or whether people feel happy or sad). The brain, which is the key to the body's neurological system, comprises between 10 billion and 100 billion nerve cells, or neurons.

Neurons join to produce the body's nerves, which are tiny cords that run from head to toe and everywhere in between. Neurons receive and transmit electrical signals known as impulses, which govern and respond to everything your body does and experiences. The brain is like an extremely busy, high-speed post office, continuously receiving and delivering letters; it processes millions of nerve impulses each second.