The nervous system
Nervous system is a system of organs which controls and  co-ordinates all the activities of our body.The nervous system consists of Brain,Spinal cord,Nerves and Sense organs. Brain-The brain is the most delicate and important part of the nervous system.It is situated in the head and is well protected by the skull. It weights about 1.3 kg.The left part of the brain controls right part of our body and the right part of the brain controls left part of our body.Spinal cord-It is a tube like structure which is attached to the brain.It runs inside the vertebral column.The spinal cord is about 50 cm long.It carries message from the brain to all parts of the body,and from the body to the brain.

Nerves-The nervous system is made up of billions of nerves   cells which carries messages throughout the body.The message travel through the cell as a small electrical current called nerve impulse
Sense organ-Humans have five sense organs of different senses.THEY are:Nose,Tongue,Skin,Eyes and Ears.These organs receive messages in the form of 
sensation which send it to the brain through sensory nerves.




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