The nervous system- Hệ thần kinh
The nervous system is the highway along which your brain sends and receives information about what is happening in the body and around it. This highway is made up of billions of nerve cells, or neurons (say new-rons) which join together to make nerves.
The central nervous system
The brain and the spinal cord make up the central nervous system. The brain lies protected inside the skull and from there controls all the body functions by sending and receiving messages through nerves.
- These chemicals transmit nerve impulses from one nerve to another or from nerves to muscle cells.
- An electrical nerve impulse travels along the neuron to these sacs which then release the neurotransmitter chemicals.
- The chemicals move along to the next neuron sparking an electrical charge which moves the nerve impulse forward.
- This happens several times until the message gets where it’s going.
The nervous system works like your light bulb, once you press the switch then the wire send electricity to the light bulb!