nervous system more appropriate neurons
Nerve!
The nervous system.
the nerve system conducts messages trough the human body
Nervous system
nervous tissue
The axons and dendrites.
Your nervous system carries electric signals from your brain trough out your body.
Hormones send messages throughout the body using chemical signals. For example, adrenaline, or ephinephrine, is sent to the brain when something stressful is present, and causes a height in energy, higher pulse, perhaps sweaty hands, etc.
nerve
I think the answer you're looking for here is nervous tissue which carries action potentials, or nervous impulses, between the tissues and are central nervous system. However, from another point of view you could also consider the cardiovascular system as carrying hormonal messages throughout the body.
I believe it would be your brain stem
it is called the golgy body