Behavior elements

Why do psychologists study the brain and nervous system?
What are the basic elements of the nervous system?
How does the nervous system communicate electrical and chemical messages from one part to another?
The _____________ is the fundamental element of the nervous system.
Neurons receive information through their ______________ and send messages through their ____________.
Just as electrical wires have an outer coating, axons are insulated by a coating called the ____________ .
The gap between two neurons is bridged by a chemical connection called a _______________.
Endorphins are one kind of ________________, the chemical “messengers” between neurons.