Answer:
The nervous system is the master controlling and communicating system of the body. Every thought, action, and emotion reflects its activity. Its signaling device, or means of communicating with body cells, is electrical impulses, which are rapid and specific and cause almost immediate responses.
The nervous system does not work alone to regulate and maintain body homeostasis; the endocrine system is a second important regulating system.
The functional classification scheme is concerned only with PNS structures.
Neurons, also called nerve cells, are highly specialized to transmit messages (nerve impulses) from one part of the body to another.
Because the brain is the largest and most complex mass of nervous tissue in the body, it is commonly discussed in terms of its four major regions – cerebral hemispheres, diencephalon, brain stem, and cerebellum.
The diencephalon, or interbrain, sits atop the brain stem and is enclosed by the cerebral hemispheres.
The three connective tissue membranes covering and protecting the CNS structures are the meninges.
Step-by-step explanation: