What is nervous system? Give its division.

Nervous system is network of organs and tissues that controls and coordinates all the activities of the body with the help of nerves. It is essentially the body's electrical wiring. Structurally, the nervous system has two components: the central nervous system and the peripheral nervous system which are the main two system working 24/7.

For example : rapid conduction of messages in the form of electrical impulses form of electrical impulses from one part of the body to other. It is divided into three subsystems : 

• Central Nervous system (CNS)
• Peripheral Nervous system (PNS) 
• Autonomic nervous system (ANS) 

These all system of the nervous system work together and make sure that the function of the body takes place properly.