Your brain communicates with your body and your body communicates with your Brain (interal organs, muscles, and other cells). It does this via hormones, neurotransmitters and other chemical messengers. The key word here is messenger’s. Your Hormones are chemical messengers, your Neurotransmitters are chemical messengers, etc...
These Neurotransmitters control our thoughts, mood, behavior, cognitive functions, energy levels, intestinal functions, blood flow, immune response, sleep patterns, appetite, libido, metabolism, pain perception and pain tolerance, vision, and well being.
