So, have you been told you may have a chemical imbalance in the brain?  What does that mean.  I found an explanation below to help you better understand what this chemical is.

“The brain consists of about 100 billion cells.  Most of these cells are called neurons.  A neuron is basically an on/off switch just like the one you use to control the lights in your home.  It is either in a resting state (off) or it is shooting an electrical impulse down a wire (on).  It has a cell body, a long little wire (the “wire” is called an axon), and at the very end it has a little part that shoots out a chemical.  This chemical goes across a gap (synapse) where it triggers another neuron to send a message.  There are a lot of these neurons sending messages down a wire (axon). By the way, each of these billions of axons is generating a small amount of electrical charge; this total power has been estimated to equal a 60 watt bulb.  Doctors have learned that measuring this electrical activity can tell how the brain is working.  A device that measures electrical activity in the brain is called an EEG (electroencephalograph).

Each of the billions of neurons “spit out” chemicals that trigger other neurons.  Different neurons use different types of chemicals.  These chemicals are called “transmitters” and are given names like epinephrine, norepinephrine, or dopamine.”

Quoted from Source:  How the Brain Works

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