Question

functions of nervous system

Answer 1

(i) Collects information from the surroundings.
(ii) Controls and co-ordinates the movement of muscles.
(iii) Helps to recognise smell, taste, vision, hearing etc. with the help of sense organs.

Nervous system is the organ system present in the animals to control and coordinate different activities of the body. Nervous system comprises of the brain, the spinal cord, and a huge network of nerves that are spread throughout the body. The nervous system is responsible for sending, receiving and processing messages in the form of chemical signals called as impulses.
Central nervous system: It includes the brain and the spinal cord. It receives information from the body and sends out instructions to particular organs. CNS interprets information whereas peripheral nervous system collects information and sends impulses.

Peripheral nervous system: It consists of the cranial and spinal nerves. The peripheral nervous system is divided into autonomous nervous system and somatic nervous system.
*Autonomic nervous system includes motor nerves that control involuntary actions like breathing, beating of the heart, and peristaltic movements of the alimentary canal. It has two parts namely sympathetic nervous system and parasympathetic nervous system.
*Somatic nervous system includes voluntary actions like muscle movement and blinking of the eyelids.