The nervous system is like your body's messaging system. It has two main parts:

Central Nervous System (CNS):

It's the boss, including the brain and spinal cord.

Brain thinks, spinal cord is a messaging highway.

Peripheral Nervous System (PNS):

Messengers that carry info between CNS and body.

Sensory nerves bring info in, motor nerves take instructions out.

Neurons:

Tiny messengers that use electrical signals.

Sensory neurons tell brain, motor neurons move muscles.

Communication:

Neurons talk through synapses using chemicals.

It's like passing notes between neurons.

Response:

Touch something hot -> sensory neurons tell brain -> brain says "move!" -> motor neurons make you move your hand.

In short, nervous system helps your body talk to itself, making sure you feel, think, and move the way you should!