Will give brainiest!! The nervous system is the major controlling, regulatory and communicating system in the body. It is the center of all mental activity including thought, learning and memory.

(A) Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis.
(B) Like other systems in the body, the nervous system is composed of organs, principally the brain, spinal cord, nerves and ganglia
. (C) These, in turn, consist of various tissues, including nerve, blood and connective tissue.
(D) Sensory input is converted into electrical signals called nerve impulses that are transmitted to the brain.