2.83 - central nervous system

- the sense organs (skin, tongue, nose, eyes and ears) are connected to the brain, spinal cord, and peripheral nerves to make up the nervous system
- the brain co-ordinates the actions of the body
- signals are sent through the nervous system through electrical impulses
- the types of nerve cells are called neurons
sensory neurons carry signals to the CNS
- motor neurons carry signals to the CNS, controlling how the body responds
- relay neurons connect other neurons together